UPD4992CX 查看數據表（PDF） - NEC => Renesas Technology

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UPD4992CX

8-Bit Parallel I/O Calendar Clock

NEC => Renesas Technology 

µPD4992

PIN FUNCTION

Pin symbol

CS1

CS2

WR

Pin name

Chip select input

Chip select input

Write signal input

RD

Read signal input

D0 to D7

A0 to A2

TP

Data input/output

Address input

Timing pulse output

XIN

XOUT

VDD

VSS

Crystal resonator connection pin

Crystal resonator connection pin

Power supply pin

GND

Pin number

2

17

3

7

8, 9, 11 to 16

4 to 6

1

19

18

20

10

Function

Internal register can be accessed when CS1 = L

and CS2 = H

Writes the contents of data bus to the register

selected by address input at the rising edge

Outputs the contents of the register selected by

address input to the data bus at the rising edge

Data input/output bus

Address input to select internal register

Interval signal and timing pulse output (N ch open

drain output)

Crystal resonator and capacitor are connected to

these pins.

2.4 V to 5.5 V

Connect to GND

External components (crystal resonator, capacitors) must be located as close as the IC, and separated as far as

from high speed clock wiring.

VDD

XIN

XOUT

C1

X

C2

5 V or 0 V

X: 32.768 kHz

C1, C2: 10 to 30 pF

6

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