TMP88CU74F datasheet(16/132 Pages) TOSHIBA

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TMP88CU74

2003-02-17

88CU74-16

Figure 1.4.9 Level-sensitive Release Mode

Note 1: Even if the STOP pin input is low after warming up start, the STOP mode is not restarted.

Note 2: In this case of changing to the level-sensitive mode from the edge-sensitive mode, the release

mode is not switched until a rising edge of the STOP pin input is detected.

Edge-sensitive release mode (RELM = “0”)

In this mode, STOP mode is released by a rising edge of the STOP pin input.

This is used in applications where a relatively short program is executed

repeatedly at periodic intervals. This periodic signal (for example, a clock from a

low-power consumption oscillator) is input to the STOP pin. In the edge-sensitive

release mode, STOP mode is started even when the STOP pin input is high level.

Example: Starting STOP mode from NORMAL mode

(SYSCR1), 10010000B

;

Starts after specified to the edge-sensitive

release mode

Figure 1.4.10 Edge-sensitive Release Mode

STOP mode is released by the following sequence.

In the dual-clock mode, when returning to NORMAL2, both the high-frequency

and low-frequency clock oscillators are turned on; when returning to SLOW mode,

only the low-frequency clock oscillator is turned on. In the signal-clock mode, only

the high-frequency clock oscillator is turned on.

A warming-up period is inserted to allow oscillation time to stabilize. During

warm-up, all internal operations remain halted. Four different warming-up times

can be selected with the WUT (bits 2 and 3 in SYSCR1) in accordance with the

resonator characteristics.

STOP

XOUT pin

NORMAL operation

Confirm by program that the

STOP

pin input is low and

start STOP mode.

VIH

STOP mode is released by the hardware.

Always released if the STOP

pin input is high.

NORMAL operation

STOP operation

Warm-up

STOP

NORMAL operation

STOP mode started

by the program.

XOUT pin

STOP mode is released by the hardware at the rising

edge of STOP pin input.

VIH

Warm-up

NORMAL

operation

STOP operation

2007-10-19

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