AT89C51AC3-RDTUM datasheet(25/143 Pages) ATMEL

Part #	AT89C51AC3-RDTUM

Description	Enhanced 8-bit Microcontroller with 64KB Flash Memory

PDF	143 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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AT89C51AC3

4383B–8051–01/05

Registers

Table 6. PSW Register

PSW (S:8Eh)

Program Status Word Register

Reset Value = 0000 0000b

Table 7. AUXR Register

AUXR (S:8Eh)

Auxiliary Register

543

210

RS1

RS0

Bit

Number

Bit

Mnemonic Description

7CY

Carry Flag

Carry out from bit 1 of ALU operands.

6AC

Auxiliary Carry Flag

Carry out from bit 1 of addition operands.

5F0

User Definable Flag 0.

4-3

RS1:0

Refer to Table 4 for bits description.

2OV

Overflow Flag

Overflow set by arithmetic operations.

1F1

User Definable Flag 1

Parity Bit

Set when ACC contains an odd number of 1’s.

Cleared when ACC contains an even number of 1’s.

543

210

XRS2

XRS1

XRS0

EXTRAM

Bit

Number

Bit

Mnemonic Description

7-6

Reserved

The value read from these bits are indeterminate. Do not set this bit.

5M0

Stretch MOVX control:

the RD/ and the WR/ pulse length is increased according to the value of M0.

Pulse length in clock period

AT89C51AC3-RDTUM Datasheet(PDF) 25 Page - ATMEL Corporation

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