AT89C5131-RDTIL datasheet(147/176 Pages) ATMEL

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147

AT89C5131

4136B–USB–09/03

Figure 69. 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.

This 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.

INT1

INT0

XTALA

Power-down Phase

Oscillator restart Phase

Active Phase

XTALB

Table 105. State of Ports

Mode

Program

Memory

ALE

PSEN

PORT0

PORT1

PORT2

PORT3

PORTI2

Idle

Internal

Port

Data

(1)

Port

Data

Port Data

Port

Data

Idle

External

Floating

Port

Data

Address

Port Data

Port

Data

Power-down

Internal

Port

Data

(1)

Port

Data

Port Data

Port

Data

Power-down

External

Floating

Port

Data

Port Data

Port

Data

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