TMP88CU74F datasheet(17/132 Pages) TOSHIBA

17 / 132 page

TMP88CU74

2003-02-17

88CU74-17

When the warming-up time has elapsed, normal operation resumes with the

instruction following the STOP mode start instruction (e.g. [SET (SYSCR1). 7]).

The start is made after the prescaler and the divider of the timing generator are

cleared to “0”.

Table 1.4.2 Warming-up Time Example (at fc

= 12.5 MHz, fs = 32.8 kHz)

Warming-up Time [ms]

Return to NORMAL mode

WUT

DV1CK

= 0

DV1CK

= 1

Return to SLOW mode

15.729

5.243

3.932

1.311

31.457

10.486

7.864

2.621

750

250

⎯

Note:

The warming-up time is obtained by dividing the basic clock by the divider: therefore, the

warming-up time may include a certain amount of error if there is any fluctuation of the

oscillation frequency when STOP mode is released. Thus, the warming-up time must be

considered an approximate value.

STOP mode can also be released by inputting low level on the RESET pin,

which immediately performs the normal reset operation.

Note:

When STOP mode is released with a low hold voltage, the following cautions must be

observed.

The power supply voltage must be at the operating voltage level before releasing STOP

mode. The RESET pin input must also be “H” level, rising together with the power supply

voltage. In this case, if an external time constant circuit has been connected, the RESET

pin input voltage will increase at a slower pace than the power supply voltage. At this time,

there is a danger that a reset may occur if input voltage level of the RESET pin drops below

the non-inverting high-level input voltage (hysteresis input).

2007-10-19

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