user manual

INSTRUCTION DESCRIPTIONS
MOTOROLA INSTRUCTION SET DETAILS A - 43
Instruction Format:
BCHG #n,X:ea
BCHG #n,Y:ea
Opcode:
Instruction Fields:
#n=bit number=bbbbb,
ea=6-bit Effective Address=MMMRRR
Effective
Addressing Mode M M M R R R Memory SpaceS Bit Number bbbbb
(Rn)-Nn 0 0 0 r r r X Memory 0 00000
(Rn)+Nn 0 0 1 r r r Y Memory 1
•
(Rn)- 0 1 0 r r r
•
(Rn)+ 0 1 1 r r r •
(Rn) 1 0 0 r r r 10111
(Rn+Nn) 1 0 1 r r r
-(Rn) 1 1 1 r r r
Absolute address 1 1 0 0 0 0
where “rrr” refers to an address register R0-R7
Timing: 4+mvb oscillator clock cycles
Memory: 1+ea program words
23 16 15 8 7 0
OPTIONAL EFFECTIVE ADDRESS EXTENSION
0000101 1 01MMMRRR0S0bbbbb
BCHG Bit Test and Change BCHG