T83C5121 datasheet(17/110 Pages) ATMEL

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T8xC5121

4164E–SCR–02/04

Reduced EMI Mode

The ALE signal is used to demultiplex address and data buses on port 0 when used with

external program or data memory. Nevertheless, during internal code execution, ALE

signal is still generated.

Only in case of PLCC52 version, in order to reduce EMI, ALE signal can be disabled by

setting AO bit.

The AO bit is located in AUXR register at bit location 0 (See Table 4). As soon as AO is

set, ALE is no longer output but remains active during MOVX and MOVC instructions

and external fetches. During ALE disabling, ALE pin is weakly pulled high.

Power Modes Control

Registers

Table 3. PCON Register

PCON (S:87h)

Power Configuration Register

Reset Value = X0XX XX00b

SMOD1

SMOD0

LEDPD

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

LEDPD

LED Control Power-Down Mode bits

When cleaned the I/O pull-up is the standard C51 pull-up control. When set the

medium pull-up is disconnected.

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.

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