UPD17708 datasheet(148/356 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]

Página de inicio	http://www.nec.com/

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µPD17704, 17705, 17707, 17708, 17709

148

13. TIMERS

Timers are used to manage the program execution time.

13.1 Outline of Timers

Figure 13-1 outlines the timers.

The following five timers are available.

•

Basic timer 0

•

Timer 0

•

Timer 1

•

Timer 2

•

Timer 3

Basic timer 0 detects the status of a flip-flop that is set at fixed time intervals in software.

Timers 0 through 3 are modulo timers and can use interrupts.

Basic timer 0 can also be used to detect a power failure. Timer 3 is multiplexed with the D/A converter.

The clock of each timer is created by dividing the system clock (4.5 MHz).

Figure 13-1. Outline of Timers (1/2)

(1) Basic timer 0

(2) Timer 0

(3) Timer 1

Clock selection

4.5 MHz

BTM0CY flag

Flip-flop

Clock selection

4.5 MHz

Gate control

TM0G

Start/stop

8-bit counter

Interrupt control

Coincidence detection

Overflow

Modulo register

Clock selection

4.5 MHz

Start/stop

8-bit counter

Interrupt control

Coincidence detection

Modulo register

UPD17708 Datasheet(PDF) 148 Page - NEC

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