Samsung KS57C2308 Manual page 99

KS57C2308/P2308/C2316/P2316
ADC
— Add With Carry
ADC (Continued)
Examples: 3. If ADC A,@HL is followed by an ADS A,#im, the ADC skips on carry to the instruction
immediately after the ADS. An ADS instruction immediately after the ADC does not skip even
if an overflow occurs. This function is useful for decimal adjustment operations.
a. 8 + 9 decimal addition (the contents of the address specified by the HL register is 9H):
RCF
LD
ADS
ADC
ADS
JPS
b. 3 + 4 decimal addition (the contents of the address specified by the HL register is 4H):
RCF
LD
ADS
ADC
ADS
JPS
A,#8H
A,#6H
A,@HL
A,#0AH
XXX
A,#3H
A,#6H
A,@HL
A,#0AH
XXX
; C "0"
; A 8H
; A 8H + 6H = 0EH
; A 0EH + 9H + C(0) = 7H, C
; Skip this instruction because C = "1" after ADC result
; C "0"
; A 3H
; A 3H + 6H = 9H
; A 9H + 4H + C(0) = 0DH
; No skip. A 0DH + 0AH = 7H
; (The skip function for "ADS A,#im" is inhibited after an
; "ADC A,@HL" instruction even if an overflow occurs.)
SAM47 INSTRUCTION SET
"1"
5-25