AT89C5122D-RDRUM datasheet(179/208 Pages) ATMEL

179 / 208 page

179

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Figure 108.

Power-down Exit Waveform

Exit from power-down by reset redefines all the SFRs, exit from power-down by external

interrupt does no affect the SFRs.

Exit from power-down by either reset or external interrupt does not affect the internal

RAM content.

Note:

If idle mode is activated with power-down mode (IDL and PD bits set), the exit sequence

is unchanged, when execution is vectored to interrupt, PD and IDL bits are cleared and

idle mode is not entered.

Table shows the state of ports during idle and power-down modes.

Note:

1. Port 0 can force a 0 level. A "one" will leave port floating.

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. 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. 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.

INT1

INT0

XTAL1

Power-down phase

Oscillator restart phase

Active phase

Table

State of Ports

Mode

Program Memory

ALE

PSEN

Idle

Internal

Port Data(1)

Port Data

Idle

External

Floating

Port Data

Address

Port Data

Power-down

Internal

Port Dat*

Port Data

Power-down

External

Floating

Port Data

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