W741C260 Datasheet, PDF (82/92 Pages) Winbond – 4-BIT MICROCONTROLLER

W741C260
Instruction Set Table 2, continued
RTN
Return from subroutine
Machine Code:
Machine Cycle:
Operation:
Description:
SBC R, ACC
00000001
00000000
1
(PC) ← STACK
The program counter (PC10 to PC0) is restored from the stack. A return
from a subroutine occurs.
Subtract ACC from R with Borrow
Machine Code:
Machine Cycle:
Operation:
Description:
Flag Affected:
SBC WR, #I
0 0001010
0 R6 R5 R4 R3 R2 R1 R0
1
ACC ← (R) - (ACC) - (CF)
The contents of the ACC and CF are binary subtracted from the contents of
the data memory location addressed by R6 to R0 and the result is loaded
into the ACC.
CF & ZF
Subtract immediate data from WR with Borrow
Machine Code:
00001110
I3 I2 I1 I0 W3 W2 W1 W0
Machine Cycle:
Operation:
Description:
Flag Affected:
1
ACC ← (WR) - I - (CF)
The immediate data I and CF are binary subtracted from the contents of
the WR and the result is loaded into the ACC.
CF & ZF
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