5

80C32E

4149M–AERO–06/04

Idle and Power-down

Operation

Idle mode allows the interrupt, serial port and timer blocks to continue to operate while

the clock of the CPU is gated off.

Power-down mode stops the oscillator.

Table 1. PCON Register

PCON – Power Control Register

Reset Value = 000X 0000

Not bit addressable

765

43

21

0

SMOD

-

-

-

GF1

GF0

PD

IDL

Bit

Number

Bit

Mnemonic

Description

7SMOD

Double Baud Rate bit

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

6-

Reserved

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

5-

Reserved

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

4-

Reserved

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

3GF1

General-purpose Flag

Cleared by user for General-purpose usage.

Set by user for General-purpose usage.

2GF0

General-purpose Flag

Cleared by user for General-purpose usage.

Set by user for General-purpose usage.

1PD

Power-down mode bit

Cleared by hardware when reset occurs.

Set to enter power-down mode.

0IDL

Idle mode bit

Clear by hardware when interrupt or reset occurs.

Set to enter idle mode.