UPD17708 datasheet(173/356 Pages) NEC

No. de pieza	UPD17708

Descripción Electrónicos	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

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Fabricante Electrónico	NEC [NEC]

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µPD17704, 17705, 17707, 17708, 17709

13.4.2 Clock selection and start/stop control blocks

The clock selection block selects a basic clock to operate timer 1 counter.

Four types of basic clocks can be selected by using the TM1CK1 and TM1CK0 flags.

The start/stop block starts or stops the basic clock input to timer 1 by using the TM1EN flag.

Figure 13-18 shows the configuration and function of each flag.

13.4.3 Count block

The count block counts the basic clock with timer 1 counter, reads the count value, and issues an interrupt

request when its count value coincides with the value of the timer 1 modulo register.

The timer 1 counter can be reset by the TM1RES flag.

The timer 1 counter is automatically reset when its value coincides with the value of the timer 1 modulo

The value of the timer 1 counter can be read via data buffer.

Data can be written to the value of the timer 1 modulo register via data buffer.

Figure 13-18 shows the configuration of timer 1 counter clock selection register.

Figure 13-19 shows the configuration of the timer 1 counter.

Figure 13-20 shows the configuration of the timer 1 modulo register.

UPD17708 Datasheet(PDF) 173 Page - NEC