SN8F5708 datasheet(35/204 Pages) SONIX

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SN8F5708 Series

Special Function Registers

Datasheet Rev. 2.4

PSW Register (0xD0)

Bit

Field

Type

Initial

Description

R/W

Carry flag.

0: Addition without carry, subtraction with borrowing

signal, rotation with shifting out logic “0”, comparison

result < 0.

1: Addition with carry, subtraction without borrowing,

rotation with shifting out logic “1”, comparison

result ≥ 0.

R/W

Auxiliary carry flag.

0: If there is no a carry-out from 3rd bit of Accumulator

in BCD operations.

1: If there is a carry-out from 3rd bit of Accumulator in

BCD operations.

R/W

General purpose flag 0. General purpose flag available

for user.

4..3

RS[1:0]

R/W

00: 00H – 07H (Bnak0)

01: 08H – 0FH (Bnak1)

10: 10H – 17H (Bnak2)

11: 18H – 1FH (Bnak3)

R/W

Overflow flag.

0: Non-overflow in Accumulator during arithmetic

Operations.

1: overflow in Accumulator during arithmetic

Operations.

R/W

General purpose flag 1. General purpose flag available

for user.

Parity flag. Reflects the number of ‘1’s in the

Accumulator.

0: if Accumulator contains an even number of ‘1’s.

1: Accumulator contains an odd number of ‘1’s.

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