SN8P1602A datasheet(25/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 25

Version 1.1

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

NT0

NPD

Read/Write

R/W

After reset

RESET/WAKEUP FLAG

NT0

NPD

Description

During the sleep mode, the device wakes up by the watch dog.

Such function only valid when users set “INT_16K_RC” code option as “Always_On”

Watchdog timer overflow in normal/slow/green mode.

During the sleep mode, the device wakes up by the reset pin.

External reset or LVD reset active

Note: Watchdog timer can also be used as a fixed-period timer if the watchdog reset function has been disabled.

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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