TMP89FS60 datasheet(43/410 Pages) TOSHIBA

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Page 29

TMP89FS60

RA001

Even if the STOP pin input returns to low after the warm-up starts, the STOP mode is not restarted.

Figure 2-8 Level-sensitive Release Mode (Example when the high-frequency clock oscillation

circuit is selected)

Note: When the STOP mode is released, the warm-up counter source clock automatically changes to the clock that generated the

main system clock when the STOP mode was started, regardless of WUCCR<WUCSEL>.

Note: If the rising edge is input to the STOP pin within 1 machine cycle after SYSCR1<STOP> is set to "1", the STOP mode will not

be released.

Figure 2-9 Edge-sensitive Release Mode (Example when the high-frequency clock oscillation

circuit is selected)

- Edge-sensitive release mode

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

Setting SYSCR1<RELM> to "0" selects the edge-sensitive release mode.

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 con-

sumption oscillator) is input to the STOP pin. In the edge-sensitive release mode, the

STOP mode is started even when the STOP pin input is high

Example: Starting the STOP mode from the NORMAL mode

(Warm-up time at release of the STOP mode is about 200ms at fc=8 MHz.)

(WUCCR),0x01

; WUCCR<WUCDIV> = 00 (No division) (Note)

(WUCDR),0x19

;

Sets the warm-up time

200ms / 8

µs = 25 → 0x19

; IMF = 0

(SYSCR1) , 0x80

; Starts the STOP mode with the edge-sensitive release mode selected

STOP pin

XOUT pin

NORMAL mode

VIH

Warm-up

STOP mode

The STOP mode

is started

by the program.

The STOP mode is released by the hardware

at the rising edge of the STOP pin input.

NORMAL

mode

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