Renesas 4513 Technical Information PDF herunterladen (Seite 30)

4513/4514 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

TIMERS

The 4513/4514 Group has the programmable timers.

• 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 re-

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

• Fixed dividing frequency timer

The fixed dividing frequency timer has the fixed frequency divid-

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

count of a count pulse.

Fig. 18 Auto-reload function

n : Counter initial value

Count starts

Reload Reload

1st underflow 2nd underflow

n+1 count n+1 count

Time

An interrupt occurs or

a skip instruction is executed.

Timer interrupt

request flag

The contents of counter

“1”

“0”

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Renesas 4513 Technical Information Seite 30