S3C72P9 Datasheet, PDF(36/225 Page) Samsung semiconductor – SINGLE-CHIP MICROCONTROLLER HAS BEEN DESIGNED FOR HIGH PERFORMANCE USING

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S3C72P9 Datasheet, PDF (36/225 Pages) Samsung semiconductor – SINGLE-CHIP MICROCONTROLLER HAS BEEN DESIGNED FOR HIGH PERFORMANCE USING

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ADDRESS SPACES

S3C72P9/P72P9 (Preliminary Spec)

+ PROGRAMMING TIP â Using the Carry Flag as a 1-Bit Accumulator

1. Set the carry flag to logic one:

SCF

LD

LD

ADC

EA,#0C3H

HL,#0AAH

EA,HL

; Câ 1

; EA â #0C3H

; HL â #0AAH

; EA â #0C3H + #0AAH + #1H, C â 1

2. Logical-AND bit 3 of address 3FH with P3.3 and output the result to P5.0:

LD

LDB

BAND

LDB

H,#3H

C,@H+0FH.3

C,P3.3

P5.0,C

; Set the upper four bits of the address to the H register

; value

; C â bit 3 of 3FH

; C â C AND P3.3

; Output result from carry flag to P5.0

2-24

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