NJU3504FA1 查看數據表（PDF） - Japan Radio Corporation

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NJU3504FA1

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3504

s PRESCALER

The NJU3504 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 PRE-

Φ/2

Φ/4

SCALER Φ/8

Φ/16

Φ/32

Φ/64

Φ/128

0:ON,1:OFF

Φ/256

Φ/512

Φ/1024

Φ/2048

2 1 0 (LSB)

Φ/4096

TIMER1

TIMER2

A/D

Serial I/O

SCK/CKOUT

Terminal

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

Prescaler Divider Output Frequency

Φ/2

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 3 3 3 . 3 3 k H z

Φ/4

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 1 6 6 . 6 7 k H z

Φ/8

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 83.33kHz

Φ/16

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 4 1 . 6 7 k H z

Φ/32

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 20.83kHz

Φ/64

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 10.42kHz

Φ/128

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 5.21kHz

Φ/256

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 2.60kHz

Φ/512

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 1.30kHz

Φ/1024

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅

651kHz

Φ/2048

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅

326kHz

Φ/4096

⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅

163kHz

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