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68HC12

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

Search Results for "812a4"

  

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USB on the 812A4   [15 Articles]

André Ribeiro - Nov 6 2002
Hi everyone, I'm thinking in using USB with my 812A4, instead of the typical RS-232 or RS-485 interface, but I know very little about USB... Did anyone impl... USB on the 812A4

Fw: 812A4 losses all interrupts

RTS development - Benny Rabin - Jun 6 2002
I suspect that you might have stuck overflow problem. Is it possible??? Benny ---------- Forward Message ---------- To: <> From: "mas" <> Date: ... Fw: 812A4 losses all interrupts

812A4 C code conversion to 912_D60A   [2 Articles]

- Mar 1 2004
Anybody have the hard and fast rules for converting C code from the 812A4 to the 912_D60A? Thanks, Jim ... 812A4 C code conversion to 912_D60A

Re: Fw: HCS12 with non-multiplexed expand paged memory.   [3 Articles]

Stephen Trier - Feb 24 2003
At 10:34 AM 2/24/03 +0000, Andrew Lohmann <> wrote: >Does anyone know if there will be a variant of HCS12 with non-multiplexed >memory in the future? Check out... Re: Fw: HCS12 with non-multiplexed expand paged memory.

812A4 losses all interrupts   [3 Articles]

mas - Jun 6 2002
Hello 812A4 users,   In our 812A4 MCU based wireless system, we are using SCI0,SCI1,TOF(Timer Overflow) and RTI interrupts.Prescaler for TOF is kept 32... 812A4 losses all interrupts

Re: How to use the external ram (HC12compact)   [5 Articles]

Edward Karpicz - Sep 14 2006
"sebastian_nowak2" wrote: > Hello, > i´m working with the HC12compact, ICC12, noice and a compod. > my problem is that i can´t use the external ram from $2000 to $8000. > ... Re: How to use the external ram (HC12compact)

Banked code on 812A4 solved

Dick Webb - Mar 26 2003
Back in mid-February I posted a note to the group requesting help on getting banked code to work for my project using an 812A4 and the IAR compiler. Thanks to St... Banked code on 812A4 solved

Re: Memory Expansion 'a4 Chip

Stephen Trier - Sep 22 2003
Johnny, Interfacing a couple of RAM chips to the 812A4 is pretty straightforward. Use the built-in chip select logic if at all possible. The documentation for ... Re: Memory Expansion 'a4 Chip

812A4 errata list   [2 Articles]

- Feb 25 2003
We received from our distributor parts with 0L00N mask. Does someone know what are the difference between this mask and the previous one? Best rega... 812A4 errata list

Re: TCP IP

zeta_alpha2002 - Nov 14 2002
> Which components and schematic? I have a design using Ethernet CS8900A on 812A4 in Narrow and Wide Mode memory Map in EPAGE. Email me if you want a schematic,... Re: TCP IP

Re: Re: External memory   [2 Articles]

Stephen Trier - Apr 30 2004
Andrew, The 812A4 board I'm working on has /LSTRB wired to /UB and A0 wired to /LB on the RAM. My colleagues and I got it backwards the first time, too. Ste... Re: Re: External memory

Getting a fast clock signal   [2 Articles]

Andrew Bailie - May 19 2003
I currently run an 812A4 with a 16 MHz clock, and need an 4 MHz clock for another device. I would prefer to generate the clock inside the A4 rather than include ano... Getting a fast clock signal

Metrowerks programming A4?   [4 Articles]

Paul Johnson - Nov 6 2002
Has anyone used Codewarrior to program and 812A4? When you create a new project using stationary, in only builds a RAM version, but I want my code to run out of the... Metrowerks programming A4?

Re: current max on pin

Stephen Trier - Mar 25 2005
On Fri, Mar 25, 2005 at 05:23:35PM +0100, Pascal wrote: > I want to know what is the current max that one pin of a port could deliver? > I heard about 20mA but i fi... Re: current max on pin

Re: Any body know the SPI interface   [2 Articles]

Stephen Trier - Nov 12 2002
At 01:27 PM 11/12/02 -0800, Baljit Singh wrote: >[...] $54 does not get written to SPOCR2 location. On the older HC12 I use (812A4), SP0CR2 has only three bits t... Re: Any body know the SPI interface

COP Disable with bootloader

blackkeymaestro - Feb 16 2005
Does anyone know where I can download a bootloader for the 812A4 adapter using the Motorola 68HC12 board that DOES NOT disable the COP watchdog? I have the boo... COP Disable with bootloader

Memory Map for 812A4

panikjahn - Mar 25 2005
Dear All, I'm new in the business of using a Freescale MC68HC812A4. To start I'm using a board from Elektronikladen, it's the HC12compact. The tool chain I'm u... Memory Map for 812A4

Re: BDM connector

Stephen Trier - Dec 30 2002
At 08:41 PM 12/30/02 -0000, "zeeschplitz <>" wrote: >the EVB contains a BDM out connector (J22) What is the reason and is >there any usefull what can be done with? ... Re: BDM connector

Re: EEPROM Read and Write Access   [2 Articles]

Stephen Trier - Apr 5 2004
Neal, Buffering in RAM is also a good idea because of the EEPROM endurance spec. You might find that if you wrote to the EEPROM on every pass through a tight l... Re: EEPROM Read and Write Access

Booting w/o BDM: no ECLK?   [3 Articles]

Paul Johnson - Jun 6 2002
I have a program on a MC68HC912DT128A that boots into Normal Single Chip mode (BKGD=1, MODA=0, MODB=0), then changes to Normal Expanded Narrow mode (MODE=0xB0, PEAR... Booting w/o BDM: no ECLK?

Re: sample programs

Edward Karpicz - Dec 15 2005
>I was in the middle of some MSP430 development, when all of a sudden I > am landed with a project on the HC12 using ImageCraft C Compiler and > P&E debugger. This is all ne... Re: sample programs

Re: DP256 SPI help   [5 Articles]

Stephen Trier - Jan 29 2003
Toby, Where is the clock coming from for the data transfer back to the HC12? The Master supplies the SPI clock. On the 812A4, at least, the way to get a Master... Re: DP256 SPI help

Re: EEPROM erase on power down?

eric_cina - Mar 30 2008
Thx, I'll look into the stability of the our oscillator. Right now I'm reaching for anything because I can't seem to reproduce the problem. We have a few EEPROM routines tha... Re: EEPROM erase on power down?

Re: Checking receive pin on HC12A4

Stephen Trier - May 16 2005
On Mon, May 16, 2005 at 08:32:01PM +0530, Maria A. Lobo wrote: > Can anyone tell me whether such an instruction will malfunction on > the HC12A4 with Cosmic Compiler? H... Re: Checking receive pin on HC12A4

Re: HC12D60A sample capacitor / shared capacity?   [5 Articles]

Oliver Betz - Apr 11 2003
James M. Knox wrote: > >... yielding approx. 1.5pF, > > > >P.S.: I wish there were an extensive description of the ATD like in > >the Pink Book. > > Ame... Re: HC12D60A sample capacitor / shared capacity?

Info on the MC9S12A256B   [4 Articles]

Jared O'Mara - Sep 16 2002
Hello guys, So my Motorola rep still hasn't made me feel good about the direction the 812A4 is going. He talked about the end of life gives you 6 months to order... Info on the MC9S12A256B

A4 timer overflow does not work in debugger

Carl Ungvarsky - Mar 31 2003
Hi, I need to debug some code that uses the timer overflow interrupt (TOI). I'm finding that when I use my debugger with a 812A4 chip, I must set the TSCR reg... A4 timer overflow does not work in debugger

The M68HC812A4 at 5Vdd needs Vih (input high) to be 3.5v (0.7xVdd) for external reads. Most memories have a minimum Voh (output high) of 2.4v. This is a problem.

"Bump, Jerome" - Feb 15 2007
Hi, The M68HC812A4 at 5Vdd needs Vih (input high) to be 3.5v (0.7xVdd) for external reads. Most memories have a minimum Voh (output high) of 2.4v. This is a problem. We have ... The M68HC812A4 at 5Vdd needs Vih (input high) to be 3.5v (0.7xVdd) for external reads. Most memories have a minimum Voh (output high) of 2.4v. This is a problem.

Re: SWI spurious interrupt   [2 Articles]

Stephen Trier - May 20 2003
Carl, Look for "Customer Information" HC12_AR_527 in the 812A4 errata sheet for your mask set. HC12_AR_527 Customer Information INT.1.3 DESCRIPTION: ... Re: SWI spurious interrupt

Re: MC68HC812A4CPV8

andrewbailie2000 - Sep 12 2002
I have also been told by sales people that the 812A4 is "In decline" and that we should be looking at the HCS12 range. My problem with this is the same as yours I... Re: MC68HC812A4CPV8

Re: OT: Compact Flash on Microcontroller   [3 Articles]

zeta_alpha2002 - Apr 12 2005
> But the question on the 1GB RAM is out of question for star12. Heck No? If I can interface 60Gig hard drive to an 812A4 I can't see why it can't be done with CF car... Re: OT: Compact Flash on Microcontroller

RE: Metrowerks linker question

Paul Johnson - Jul 12 2002
Hi Daniel, > The text in the compiler manual is a little bit unfortunately formulated. > What it intended to say is, that when you modify a copy of > library a... RE: Metrowerks linker question

Re: Debug on HC812A4   [2 Articles]

Juergen Krummsdorf - Mar 5 2004
Am 05.03.04 16:37:15, schrieb Andreas Jahn <>: Hi Andreas, > >How can I execute my program (which normaly resides in the flash (program >ROM)) from data R... Re: Debug on HC812A4

Re: Using IAR Compiler for MC9s12DP256   [3 Articles]

Dick Webb - Jun 2 2003
You need to copy cstartup.s33 from its original installation folder to the current project folder, if you haven't already done so. Scan down thru the copied f... Re: Using IAR Compiler for MC9s12DP256

Metrowerks and HC12compact board setup   [7 Articles]

pell...@... - Mar 26 2005
Hi, I have difficulties to set up the HC12compact board from Elektronikladen to use it with Metrowerks CodeWarrior and NoICE. I wrote a sinple program: void main(v... Metrowerks and HC12compact board setup

not able a special programm   [3 Articles]

Stefan Brandt - Apr 25 2003
hello, some days ago i hade a problem wit programming RealTimeInterupts using the ICC12-compiler. now i am happy, that i have manages this problem, but now ... not able a special programm
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