AT83C5111 datasheet(15/86 Pages) ATMEL

15 / 86 page

AT8xC5111

4190A–8051–11/02

Registers

PCON: Power Configuration

Table 1. PCON Register (87h)

Reset value = 0000 0000b

Port Pins

The value of port pins in the different operating modes is shown on Table 9.

Table 2. Pin Conditions in Special Operating Modes

765

43210

SMOD1

SMOD0

–

POF

GF1

GF0

IDL

Bit

Number

Bit

Mnemonic

Description

7SMOD1

Double Baud Rate bit

Set to double the Baud Rate when Timer 1 is used and mode 1, 2 or 3 is

selected in SCON register.

6SMOD0

SCON Select bit

When cleared, read/write accesses to SCON.7 are to SM0 bit and read/write

accesses to SCON.6 are to SM1 bit.

When set, read/write accesses to SCON.7 are to FE bit and read/write

accesses to SCON.6 are to OVR bit. SCON is Serial Port Control register.

–

Reserved

Must be cleared.

4POF

Power-off flag

Set by hardware when V

DD rises above VRET+ to indicate that the Power Supply

has been set off.

Must be cleared by software.

3GF1

General Purpose flag 1

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

during Idle mode.

2GF0

General Purpose flag 0

One use is to indicate wether 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.

Mode

Program Memory

Port 1 Pins

Port 3 Pins

Port 4 Pins

Reset

Don’t care

Weak High

Idle

Internal

Data

Power-down

Internal

Data

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