SN8P1602AX datasheet(27/94 Pages) SONIX

27 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 27

Revision 1.94

PROGRAM FLAG

The PFLAG includes carry flag (C), decimal carry flag (DC) and zero flag (Z). If the result of operating is zero or there

is carry, borrow occurrence, then these flags will be set to PFLAG register.

086H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PFLAG

Read/Write

R/W

After reset

CARRY FLAG

C = 1: When executed arithmetic addition with overflow or executed arithmetic subtraction without borrow or executed

rotation instruction with logic “1” shifting out.

C = 0: When executed arithmetic addition without overflow or executed arithmetic subtraction with borrow or executed

rotation instruction with logic “0” shifting out.

DECIMAL CARRY FLAG

DC = 1: If executed arithmetic addition with overflow of low nibble or executed arithmetic subtraction without borrow of

low nibble.

DC = 0: If executed arithmetic addition without overflow of low nibble or executed arithmetic subtraction with borrow of

low nibble.

ZERO FLAG

Z = 1: When the content of ACC or target memory is zero after executing instructions involving a zero flag.

Z = 0: When the content of ACC or target memory is not zero after executing instructions involving a zero flag.

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