W741C260 Datasheet, PDF (54/92 Pages) Winbond – 4-BIT MICROCONTROLLER

W741C260
Instruction Set Table 2, continued
DEC R
Decrement R contents
Machine Code:
01001010
1 R6 R5 R4 R3 R2 R1 R0
Machine Cycle:
Operation:
1
ACC, R ← (R) - 1
Description:
Decrement the data memory contents and load result into the ACC and the
data memory.
Flag Affected:
DIS INT
CF & ZF
Disable Interrupt function
Machine Code:
01010000
10000000
Machine Cycle:
Operation:
Description:
DSKNZ R
1
Disable interrupt function
Interrupt function is inhibited by executing this instruction.
Decrement R contents then skip if ACC ! = 0
Machine Code:
01001000
1 R6 R5 R4 R3 R2 R1 R0
Machine Cycle:
Operation:
Description:
Flag Affected:
1
ACC, R ← (R) - 1;
PC ← (PC) + 2 if ACC ! = 0
Decrement the data memory contents and load result into the ACC and the
data memory. If ACC ! = 0, the program counter is incremented by 2 and
produces a skip.
CF & ZF
- 54 -