SD6830 datasheet(29/34 Pages) AUK

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KSI-W002-000

NOT

Binary code

00010111

Syntax

[<label>] NOT

Operation

(A) ← /(A)

Flags

CY : Unaffected

SF : Unaffected

Words/Cycles :

1/1

Description

The contents of accumulator are 1

Example

LDA 7

NOT

; 1’s complement 7, then leaves 8 in A

RET

Binary code

: 00011101

Syntax

: [<label>] RET

Operation

: (PC) ← (SK0), (SK0) ← (SK1)

Flags

: CY: Unaffected

SF: Unaffected

Words/Cycles : 1/1

Description

: Returns from the subroutine to main routine.

Example

: RET ; Returns from the subroutine to main routine

RRC

Binary code

: 00010011

Syntax

: [<label>] RRC

Operation

: (A.b) ← (A.b+1) (A.3) ← (CY) (CY) ← (A.0)

Flags

: CY : Set to bit 0 of the accumulator

SF : Unaffected

Words/Cycles : 1/1

Description

: Shifts the contents of accumulator 1-bit to the right through the carry.

The carry bit content shifts into the bit 3 of accumulator, and the bit 0 of

accumulator is shifted into the carry bit.

Example

: SETB CY ; Set CY to one.

LDA

; Load 5 to A

RRC

; CY becomes zero, and the contents of A is 11

SD6830

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