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 TIMER

The NJU3502 prepares Programmable Timer consisted of 8-bit binary counter.

[Structure of TIMER]

DB (4-bit)

4

DEMULTIPLEXER

4

4

INITIAL VALUE REGISTER

8

8-bit TIMER

4

4

MULTIPLEXER

4

TIMER INTERRUPT

INTERNAL CLOCK

PHY3 − b2 b1 b0

TIMER CONTROL REGISTER

Timer counts only the internal clock. The initial value of the Timer can be set the optional value by the

program which instructs to write the data(a value of the time-interval) into the Initial Value Register. In

enabling the Timer interrupt, when the Timer counts from "FF" to "00" (overflow), the Timer interrupt request

occurs and the internal interrupt process starts the own operation.

In the repeat mode of the Timer operation, when the Timer overflows, the initial value is loaded into the Timer

automatically and the Timer continues the count from the loaded initial value (Auto re-load function: See the

repeat mode of the Timer operation timing chart). In the single mode of the Timer operation, when the Timer

overflows, the count is stopped(See the single mode of the Timer operation timing chart). For starting the

count operation again, the start bit(LSB) of Timer Control Register must be set to "1". The latest initial value is

set into the Timer and the Timer starts the count.

In enabling the interrupt operation, when the Timer overflows, the Timer overflow flag is set to "1" and the

internal interrupt process starts the own operation. In disabling the Timer interrupt, the Timer overflow flag is

not set. The Timer overflow flag is initialized by the Timer Start or the Reset signal.

The internal clock into the counter is the divided clock from the internal prescaler. the frequency of the clock

can be selected by the mask option from follows which are the dividing numbers based on the inverse of the 1-

instruction executing period(1/fOSC x 6).

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

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