TMP93CS41 datasheet(21/248 Pages) TOSHIBA

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TMP93CS40/TMP93CS41

2004-02-10

93CS40-19

(1) Switching from NORMAL to SLOW mode

When the resonator is connected to the X1 and X2, or to the XT1 and XT2 pins, the

warm-up timer is used to change the operation frequency after stable oscillation is

attained.

The warm-up time can be selected by WDMOD<WARM>.

This starting and stopping of the warm-up timer are performed by programming as

in the following examples 1 and 2.

Note 1: The warm-up timer is also used as a watchdog timer. So when it is to be used as

a warm-up timer, the watchdog timer function must be disabled.

Note 2: In the case of using an oscillator (not resonator) with stable oscillation, a warm-up

timer is not needed.

Note 3: The warm-up timer is operated by an oscillation clock. Therefore there is an error

in, warm-up time.

Table 3.3.2 Warm-up Time

Warm-up time

WDMOD<WARM>

Change to NORMAL

(fc)

Change to SLOW

(fs)

0 (214/frequency)

0.8192 ms

500 ms

1 (2

16/frequency)

3.2768 ms

2000 ms

at fc

= 20 MHz,

= 32.768 kHz

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