Xycom XVME 200, Manual

Page: 37 / 57

XVME-200/290 Manual
December, 1987
3.5 PROGRAMMKNG EXAMPLES
The two 68000 CPU code programming examples which follow, demonstrate general
methods of initialization of the 68230 PI/T devices on the XVME-200 and XVME-290
Modules. The following equates will be used in both examples:
; Interrupt vectors.
PVCTR EQU $___
TVCTR EQU $___
; Port interrupt vector.
; Timer interrupt vector.
; Values to preload counter.
CHIGH
EQU $____
; High byte.
CMID EQU $___ ; Middle byte.
CLOW E Q U
$___ ; Low byte.
; 68230 Base Address and Register Offsets.
BASE200 EQU $
; XVME-200 Module base address
(jumper selectable).
PI/TlBASEQU BASE200
+ $00; 68230 PI/T
#l base address.
PI/T2BASEQU BASE200 + $40; 68230 PI/T #2 base address.
PCGR
PSRR
PADDR
PBDDR
PCDDR
PIVR
PACR
P B C R
PADR
PBDR
PAAR
PBAR
PCDR
P S R
T C R
TIVR
C P R H
CPRM
CPRL
CNTRH
CNTRM
C N T R L
T S R
EQU $01
; Port general control register.
EQU $03
; Port service request register.
EQU $05
; Port A data direction register.
EQU $07
; Port B data direction register.
EQU $09 ; Port C data direction register.
EQU
$OB
; Port interrupt vector register.
EQU $OD ; Port A control register.
EQU
$OF
; Port B control register.
EQU$ll
; Port A data register.
EQU $13
; Port B data register.
EQU $15
; Port A alternate register
EQU $17
; Port B alternate register.
EQU $19
; Port C data register.
EQU $lB ; Port status register.
EQU $21
; Timer control register.
EQU $23
; Timer interrupt vector register.
EQU $27 ; Counter preload register - high byte.
EQU $29 ; Counter preload register - mid byte.
EQU
$2B
; Counter preload register - low byte.
EQU $2F ; Count register - high byte.
EQU $31 ; Count register - mid byte.
EQU $33 ; Count register - low byte.
EQU $35 ; Timer status register.
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