COPC912C Datasheet, PDF (15/24 Pages) National Semiconductor (TI) – COP912C/COP912CH 8-Bit Microcontroller

Instruction Set (Continued)
 Most instructions are single byte (with immediate ad-
dressing mode instructions requiring two bytes)
 Most single byte instructions take one cycle time to exe-
cute
 Skipped instructions require x number of cycles to be
skipped where x equals the number of bytes in the
skipped instruction opcode
The following tables show the number of bytes and cycles
for each instruction in the format byte cycle
Arithmetic and Logic
Instructions (Bytes Cycles)
Instr
B
Direct
Immediate
ADD
11
34
ADC
11
34
22
SUBC
11
34
22
AND
11
34
22
OR
11
34
22
XOR
11
34
22
IFEQ
11
34
22
IFNE
11
34
22
IFGT
11
34
22
IFBNE
11
22
DRSZ
11
13
SBIT
11
34
RBIT
11
34
IFBIT
11
34
Instructions Using A and C (Bytes Cycles)
Instr
CLRA
INCA
DECA
LAID
DCOR
RRCA
SWAPA
SC
RC
IFC
IFNC
Bytes Cycles
11
11
11
13
11
11
11
11
11
11
11
Transfer of Control Instructions
(Bytes Cycles)
Instr
JMPL
JMP
JP
JSRL
JSR
JID
RET
RETSK
RETI
INTR
NOP
Bytes Cycles
34
23
13
35
25
13
15
15
15
17
11
Memory Transfer Instructions (Bytes Cycles)
Instr
XA^a
LD A
LD B Imm
LD B Imm
LD Mem Imm
LD Reg Imm
Register Indirect
B
X
11
11
13
13
22
a Memory location addressed by B or X directly
b IF B k 16
c IF B l 15
Direct
23
23
33
23
Immed
22
1 1^b
2 3^c
Register Indirect
Auto Incr and Decr
Ba Bb
Xa Xb
12
12
13
13
22
15
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