UPD75036CW-XXX Просмотр технического описания (PDF) - NEC => Renesas Technology

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производитель

UPD75036CW-XXX

4 BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75036

5.5 CLOCK TIMER

The µPD75036 contains one channel for a clock timer. The clock timer provides the following functions:

• The clock timer sets the test flag (IRQW) every 0.5 seconds.

The standby mode can be released with IRQW.

• Either the main system clock or subsystem clock can produce 0.5-second intervals.

• The fast-forward mode produces an interval 128 times faster (3.91 ms), which is useful for program debugging

and testing.

• An arbitrary frequency (2.048, 4.096, or 32.768 kHz) can be output to the P23/BUZ pin, so that it can be used

for sounding the buzzer and system clock frequency trimming.

• The frequency divider can be cleared, so the clock can start from zero seconds.

From

the

clock







fX

128

(32.768

kHz)

gaetonrer-

fXT

(32.768

kHz)

Fig. 5-4 Block Diagram of the Clock Timer

fW (256 Hz: 3.91 ms)

27

fW

(32.768 kHz)

Selector

Frequency divider

4 kHz 2 kHz

Clear signal

fW

Selector

214

2 Hz

0.5 sec

INTW

IRQW

set signal

Selector

Output buffer

P23/BUZ

WM

WM7 WM6 WM5 WM4 WM3 WM2 WM1 WM0

PORT2.3

P23 output

latch

Bit 2 of PMGB

Port 2 input/

output mode

Bit test instruction

8

Internal bus

The values in parentheses indicates are for fX = 4.194304 MHz and fXT = 32.768 kHz

21

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