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UPD75212ACW

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75212A

5.6 TIMER/PULSE GENERATOR

The µPD75212A incorporates one channel of timer/pulse generator which can be used as a timer or a pulse

generator. The timer/pulse generator has the following functions.

(a) Functions available in the timer mode

• 8-bit interval timer operation (IRQTPG generation) enabling the clock source to be varied at 5 levels

• Square wave output to PPO pin

(b) Functions available in the PWM pulse generation mode

• 14-bit accuracy PWM pulse output to the PPO pin (Used as a digital-to-analog converter and applicable

to tuning)

• Fixed time interval (

215

fXX

= 7.81 ms : at 4.19 MHz operation) interrupt generation

If pulse output is not necessary, the PPO pin can be used as a 1-bit output port.

Note

If the STOP mode is set while the timer/pulse generator is in operation, miss-operation may result.

To prevent that from occurring, preset the timer/pulse generator to the stop state using its mode

register.

Fig. 5-5 Timer/Pulse Generator Block Diagram (Timer Mode)

TPGM3

(Set to "1")

Frequency

Divider

fX 1/2

TPGM1

Internal Bus

8

MODL

Modulo Register L (8)

8

MODH

Modulo Register H (8)

CP

Prescalar Select Latch (5)

Clear

Modulo Latch H (8)

8

Match

Comparator (8)

T F/F

Set

8

INTTPG

IRQTPG

Set Signal

Output Buffer

Selector

PPO

Count Register (8)

Clear

TPGM4TPGM5 TPGM7

22

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