NJU3503L 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU3503L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3503

s PRESCALER

The NJU3503 prepares a built-in Prescaler consisted of 12-bit binary counter which counts the machine cycle

period clock(1/fOSC x 6) from 2 to 4096 times. The Prescaler can supply the clock to Timer1 and 2, Serial Input

Output, A/D converter, and the external application through the “SCK/CKOUT” terminal. A frequency of the

clock can be selected from 12 kinds shown in follows.

1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512, 1/1024, 1/2048, 1/4096

When the bit2(b2) of Timer1/Prescaler control register(PHY3) is set to "1", the Prescaler operation is stopped,

but the output clock is also stopped to Timer1 and 2, Serial Input Output, A/D converter and the external

application through the "SCK/CKOUT" terminal. When the b2 of PHY3 is set to "0", the Prescaler operation is

started to count from "0".

[ AROUND THE PRESCALER BLOCK DIAGRAM ]

OSC fOSC

PHY3

Timer1/Prescaler

Control Register

(MSB) 3

CPU Φ=fOSC/6

b2 / 0:ON,1:OFF

2 1 0(LSB)

Φ/2

PRE-

Φ/4

SCALER Φ/8

Φ/16

Φ/32

Φ/64

Φ/128

Φ/256

Φ/512

Φ/1024

Φ/2048

Φ/4096

TIMER1

TIMER2

A/D

Serial I/O

CLKOUT

SCK/CKOUT

Terminal

EX.) The output frequency of Prescaler at fOSC = 4MHz (Φ=4MHz/6)

Prescaler Divider

Φ/2

Φ/4

Φ/8

Φ/16

Φ/32

Φ/64

Φ/128

Φ/256

Φ/512

Φ/1024

Φ/2048

Φ/4096

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Output Frequency

333.33kHz

166.67kHz

83.33kHz

41.67kHz

20.83kHz

10.42kHz

5.21kHz

2.60kHz

1.30kHz

651kHz

326kHz

163kHz

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