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M34250M2

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Renesas Electronics 

TIMERS

The 4250 Group has the programmable timer.

• Programmable timer

The programmable timer has a reload register and enables

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

setting 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).

MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

FF16

n : Counter initial value

Count starts

Reload

n

1st underflow

Reload

2nd underflow

0016

Timer 1 interrupt

request flag

n+1 count

Fig. 18 Auto-reload function

n+1 count

Time

An interrupt occurs or

a skip instruction is executed.

20

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