1989_MELPS_7700_Software_Manual

APPENDIX A
CPU Instruction Execution Sequence for each Addressing Mode
Variation of the execution cycles according to the accumulator used
ADC Instruction / Immediate addressing mode
«When accumulator A is used»
Mnemonic: ADC A,#1234H Machine code: 6916 3416 1216
~ CPU
Ap (CPU)
J PG X PG X PG )xC
AHAL(CPU)
J PC
X PC+1 X PC+3 )xC
DATA (CPU)
'J< 6916 X 123416 X'-----_>C
: Op Code Operand
«When accumulator B is used»
Mnemonic: ADC B,#1234H Machine code: 4216 6916 3416 1216
~ CPU
Ap (CPU)
-:x
AH AL(CPU)
=x
PG
PC
. .
~2-cycle~~
, ,
X PG X PG )C!~
PG
X X X PC+1 PC+1 PC+2 X PC+4
DATA (CPU) :=x 4216 X Not Used X
6916
X 123416 C
Op Code Op Code Operand
189