UPD75208 datasheet(19/62 Pages) NEC

19 / 62 page

µPD75208

5.6

TIMER/PULSE GENERATOR

The

µPD75208 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 generate 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 (

= 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, erroneous operation may result.

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

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

215

fXX

MODL

MODH

TPGM3

1/2

TPGM1

TPGM4 TPGM5 TPGM7

PPO

INTTPG

Internal Bus

Modulo Register L (8)

Modulo Register H (8)

Modulo Latch H (8)

Comparator (8)

Count Register (8)

Clear

Prescalar Select Latch (5)

Clear

Frequency

Divider

(Set to "1")

Set

T F/F

Selector

Output Buffer

IRQTPG

Set Signal

Match

UPD75208 Datasheet(PDF) 19 Page - NEC

UPD75208 Datasheet(HTML) 19 Page - NEC

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

Datasheet Download

Link URL