HT85F2270 datasheet(56/226 Pages) HOLTEK

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Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

Program Status Word

This register contains the Parity flag (P), General purpose flag 1 (F1), overflow flag (OV), Register

bank select control bits (RS0, RS1), General purpose flag 0 (F0), Auxiliary Carry flag (AC) and

Carry flag (CY). These arithmetic/logical operation and system management flags are used to

record the status and operation of the microcontroller. Note that the Parity bit can only be modified

by hardware depending upon the ACC state.

PSW Register – Program Status Word Register

SFR Address: D0h

Bit

Name

RS1

RS0

R/W

POR

Bit 7

CY: Carry flag

0: No carry-out

1: An operation results in a carry during arithmetic operations and accumulator for

Boolean operations.

Bit 6

AC: Auxiliary flag

0: No auxiliary carry

1: An operation results in a carry out of the low nibbles in addition, or no borrow

from the high nibble into the low nibble on subtraction.

Bit 5

F0: General Purpose Flag 0

This bit is used as a general purpose flag by the application program.

Bit 4~3

RS1~RS0: Select Data Memory Banks

00: Bank 0

01: Bank 1

10: Bank 2

11: Bank 3

RS1

RS0

Selected Register Bank

Locations (within Internal Data Area)

Bank 0

00H – 07H

Bank 1

08H – 0FH

Bank �

10H – 17H

Bank �

18H – 1FH

Bit 2

OV: Overflow flag

0: No overflow

1: An operation results in a carry into the highest-order bit but not a carry out of the

highest-order bit or vice versa.

Bit 1

F1: General Purpose Flag 1

This bit is used as a general purpose flag by the application program.

Bit 0

P: Parity flag

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

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

This bit is used to indicate the number of ‘1’s in the Accumulator.

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