P4 and on Memory Mapping

[Ward]

p4's are not a standard off the shelf HC11. P6's are almost a HC11F
The a/d is external as a seria; device.

W.


On Wed, 5 Jan 2000 18:21:58 +1100, gmecm at efi332.eng.ohio-state.edu wrote:

>  Hi all,
>  
>  On and off I've been working through a 16176424 Memcal, I've got some
>  questions on the A/D Converter in GM's 68pin HC11 type CPU, this CPU is
>  numbered 16127475.
>  Here's what I've found -
>  
>  The Motorola HC11F1 book states that the A/D registers are at -
>  $1030 (ADCTL)
>  $1031 (ADR1)
>  $1032 (ADR2)
>  $1033 (ADR3)
>  $1034 (ADR4)
>  $1039 (OPTION)
>  
>  From my disassembly of a '424' Memcal these match O.K but they are mapped
>  from $30xx, so the ADR's are at $3031 - $3034.
>  Is this a Remap of the system or is that where GM requests these to be
put
>  in their CPU's?.
>  
>  That being the case how comparable are the rest of the registers?, Port
>  locations?.
>  
>  NEXT PROBLEM -
>  
>  When an A/D conversion is requested in this PCM it does 4 channels at a
>  time, but before it does it jumps to the following two routines, I think
>  they are setting up which channels to read (0-3) or (4-7). Please
assembly
>  guru's help me out here.
>  Hope it all lines up -
>  -----------------------------------------
>  
>  ldx #0x3000    ;A/D or CPU location?
>  sei            ;Disable Interupts
>  
>  ldaa #0x07     ;??
>  jsr Routine1   ;?? Shown Below
>  
>  ldaa #0x10     ;??
>  jsr Routine2   ;?? Shown Below
>  
>  ldaa 0x31,x    ;A/D ADR1 - $3031
>  staa IATA2D    ;Store A/D IAT Value
>  ldaa 0x32,x    ;A/D ADR2 - $3032
>  staa CTSA2D    ;Store A/D CTS Value
>  ldaa 0x33,x    ;A/D ADR3 - $3033
>  staa TTSA2D    ;Store A/D TTS Value
>  ldaa 0x34,x    ;A/D ADR4 - $3034
>  staa BATA2D    ;Store A/D Batt Voltage
>  
>  cli            ;Re-enable interrupts
>  
>  **************************************
>  Routine1:
>  bclr 0x08,x,#0x38
>  lsla
>  lsla
>  lsla
>  oraa 0x08,x
>  staa 0x08,x
>  rts
>  
>  **************************************
>  Routine2:
>      staa ADCTL        ;Store at A/D Control
>      ldab #0x0C
>  LAB1: brset 0x30,x,#0x80,LAB2
>      decb
>      bne LAB1
>  LAB2: rts
>  
>  ***************************************
>  
>  
>  And lastly, we refer to the 68HC11 based ECM/PCM's as P4's right, however
>  what I don't get is the 808/165 etc use a 52pin CPU, whereas alot of the
>  later ECM/PCM's use a 68pin, different CPU's right, why the same Px
>  designation then?
>  
>  I've been out working in the garden all day, had too much time to think
>  about all this stuff :-)
>  
>  Thanks,
>  Ross Myers
>  
>  
>  
>  


Ward





_______________________________________________________
Visit Excite Shopping at http://shopping.excite.com 
 The fastest way to find your Holiday gift this season