Samsung KS57C2308 Manual page 29

KS57C2308/P2308/C2316/P2316
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PROGRAMMING TIP — Using the Carry Flag as a 1-Bit Accumulator
1. Set the carry flag to logic one:
SCF
LD
LD
ADC
2. Logical-AND bit 3 of address 3FH with P3.3 and output the result to P4.0:
LD
LDB
BAND
LDB
EA,#0C3H
HL,#0AAH
EA,HL
H,#3H
C,@H+0FH.3
C,P3.3
P4.0,C
; C 1
; EA #0C3H
; HL #0AAH
; EA #0C3H + #0AAH + #1H, C
; Set the upper four bits of the address to the H register
value
; C bit 3 of 3FH
; C C AND P3.3
; Output result from carry flag to P4.0
ADDRESS SPACES
1
2-21