Instruction Set
3-63
RISC 16−Bit CPU
* SETC Set carry bit
Syntax SETC
Operation 1 −> C
Emulation BIS #1,SR
Description The carry bit (C) is set.
Status Bits N: Not affected
Z: Not affected
C: Set
V: Not affected
Mode Bits OSCOFF, CPUOFF, and GIE are not affected.
Example Emulation of the decimal subtraction:
Subtract R5 from R6 decimally
Assume that R5 = 03987h and R6 = 04137h
DSUB ADD #06666h,R5 ; Move content R5 from 0−9 to 6−0Fh
; R5 = 03987h + 06666h = 09FEDh
INV R5 ; Invert this (result back to 0−9)
; R5 = .NOT. R5 = 06012h
SETC ; Prepare carry = 1
DADD R5,R6 ; Emulate subtraction by addition of:
; (010000h − R5 − 1)
; R6 = R6 + R5 + 1
; R6 = 0150h
To Next Page
Loading...
