UPD75402ACT datasheet(16/48 Pages) NEC

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UPD75402ACT Datasheet(PDF) 16 Page - NEC

Part #	UPD75402ACT

Description	4 BIT SINGLE-CHIP MICROCOMPUTER

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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16 / 48 page

µPD75402A(A)

5.3

CLOCK OUTPUT CIRCUIT

The clock output circuit, which outputs clock pulses from pin P22/PCL, is used for supplying clock pulses

for peripheral LSIs or for remote control output.

• Clock output (PCL):

1.05 MHz, 524 kHz, 65.5 kHz (when fXX is 4.19 MHz).

Fig. 5-2 shows the configuration of the clock output circuit.

Fig. 5-2 Configuration of the Clock Output Circuit

From the clock

generator

CLOM3

Selector

Output

buffer

Port 2 input/

output mode

specification bit

P22 output

latch

P22/PCL

Internal bus

f XX/2

PORT2.2

Bit 2 of PMGB

CLOM1 CLOM0 CLOM

Remark The clock output circuit is designed not to output high-frequency pulses when clock output is

switched between the enable and disable states.

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