T89C51AC2-SLSIM datasheet(22/121 Pages) ATMEL

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A/T89C51AC2

4127G–8051–05/06

Registers

Table 15. PCON Register

PCON (S:87h) – Power configuration Register

Reset Value = 00X1 0000b

SMOD1

SMOD0

POF

GF1

GF0

IDL

Bit

Number

Bit

Mnemonic

Description

7SMOD1

Serial port Mode bit 1

Set to select double baud rate in mode 1, 2 or 3

6SMOD0

Serial port Mode bit 0

Clear to select SM0 bit in SCON register.

Set to select FE bit in SCON register.

Reserved

The value read from this bit is indeterminate. Do not set this bit.

4POF

Power-Off Flag

Clear to recognize next reset type.

Set by hardware when Vcc rises from 0 to its nominal voltage. Can also be set by

software.

3GF1

General-purpose flag 1

One use is to indicate whether an interrupt occurred during normal operation or

during Idle mode.

2GF0

General-purpose flag 0

One use is to indicate whether an interrupt occurred during normal operation or

during Idle mode.

1PD

Power-down Mode bit

Cleared by hardware when an interrupt or reset occurs.

Set to activate the Power-down mode.

If IDL and PD are both set, PD takes precedence.

0IDL

Idle Mode bit

Cleared by hardware when an interrupt or reset occurs.

Set to activate the Idle mode.

If IDL and PD are both set, PD takes precedence.

T89C51AC2-SLSIM Datasheet(PDF) 22 Page - ATMEL Corporation

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