TS80C31X2-LIE【PDF 15/42 页】IC MCU 8BIT 30/20MHZ 44-VQFP

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4428E–8051–02/08

AT/TS80C31X2

Figure 11-1. Power-Down Exit Waveform

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

rupt does no affect the SFRs.

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

content.

Note:

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 11-1.

The state of ports during idle and power-down modes

INT1

INT0

XTAL1

Power-down phase

Oscillator restart phase

Active phase

Mode

Program

Memory

ALE

PSEN

PORT0

PORT1

PORT2

PORT3

Idle

External

Floating

Port Data

Address

Port Data

Power Down

External

Floating

Port Data

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