NJU3502L データシートの表示（PDF） - Japan Radio Corporation

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NJU3502L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3502

s PRESCALER

The NJU3502 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 Timer, Serial Input Output,

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 Timer/Prescaler control register(PHY3) is set to "1", the Prescaler operation is stopped,

but the output clock is also stopped to Timer, Serial Input Output, 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]

fOSC

OSC

PHY3

Timer/Prescaler

Control Register

(MSB) 3

Φ/2

CPU Φ=fOSC/6 PRE-

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

TIMER

Serial I/O

SCK/CKOUT

Terminal

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

Prescaler Divider

Output Frequency

Φ/2 ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 333.33kHz

Φ/4 ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 166.67kHz

Φ/8 ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 83.33kHz

Φ/16 ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 41.67kHz

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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