參數(shù)資料
型號： W65C134SQ-8
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁數(shù)： 56/60頁
文件大小： 711K
代理商： W65C134SQ-8
WESTERN DESIGN CENTER
W65C134S
March 1, 2000
51
5.2
External ROM Startup with W65C134S Mask ROMs
Future versions of the W65C134S mask ROM may vary, but each version should contain standard machine code that
allows startup to an external memory. Standard versions of the W65C134S will always contain such a startup option.
Anyone writing a custom mask ROM for the 134 is encouraged to follow this standard.
The startup standard allows a program in an external memory to be executed after RESET if the startup code WDC (in
ASCII, $57, $44, $43) is present at addresses $8000-$8002 or $0200-$0202. If the startup code is found at either set
of addresses, the mask ROM does a JMP instruction to $8004 or $0204 respectively. W65C134S chip selects CS6 and
CS7 can be used to address the memories.
The startup standard was set (and will be followed) with the original WDC-101 mask ROM in the early W65C134S
prototypes. A sample startup program (modified from WDC-101) appears below. The W65C02S RESET vector
($FFFC) should be set to STARTUP.
STARTUP
LDA
TSB
LDA
STA
#$01
BCR
#$C0
PCS3
;ENABLE EXTERNAL MEMORY BUS
;(BCR=$001B)
;ENABLE CHIP SELECTS CS6-, CS7-
;ON P36, P37 (PCS3=$0007)
;
TRY80
LDA
CMP
BNE
LDA
CMP
BNE
LDA
CMP
BNE
JMP
$8000 ;CHECK $8000 FOR 'WDC'
#'W'
TRY02
$8001
#'D'
TRY02
$8002
#'C'
TRY02
$8004 ;EXECUTE EXTERNAL ROM PROGRAM
;
TRY02
LDA
CMP
BNE
LDA
CMP
BNE
LDA
CMP
BNE
JMP
$0200 ;CHECK $0200 FOR 'WDC'
#'W'
NOEXT
$0201
#'D'
NOEXT
$0202
#'C'
NOEXT
$0204 ;EXECUTE EXTERNAL ROM PROGRAM
;
NOEXT
JMP
MASK_ROM_PROGRAM ;EXECUTE PROGRAM IN MASK ROM
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