M34570M4-XXXFP 查看數據表（PDF） - Renesas Electronics

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M34570M4-XXXFP

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Renesas Electronics 

MITSUBISHI MICROCOMPUTERS

4570 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

TIMERS

The 4570 Group has the programmable timers and a fixed

dividing frequency timer.

q Programmable timer

The programmable timer has a reload register and enables

the frequency dividing ratio to be set. It is decremented from a

set value n. When it underflows (count to n + 1), a timer interrupt

request flag is set to “1,” new data is loaded from the reload

register, and count continues (auto-reload function).

q Fixed dividing frequency timer

The fixed dividing frequency timer has the fixed frequency

dividing ratio (n). An interrupt request flag is set to “1” every n

count of a count pulse.

FF16

n : Counter initial value

Count starts

Reload

n

1st underflow

Reload

2nd underflow

0016

Timer 1 interrupt “1”

request flag

“0”

Fig. 18 Auto-reload function

n+1 count

n+1 count

Time

An interrupt occurs or

a skip instruction is executed.

19

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