M37510M1FP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M37510M1FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

7510 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Timer 1, Timer 2, Timer 3

Timer 1, timer 2, and timer 3 are 8-bit timers. The count source for

each timer can be selected by timer 123 mode register. The timer

latch value is not affected by a change of the count source. How-

ever, because changing the count source may cause an

inadvertent count down of the timer.

Therefore, rewrite the value of timer whenever the count source is

changed.

Timer 2 Write Control

If the timer 2 write control bit is “0”, when the value is written in the

address of timer 2, the value is loaded in the timer 2 and the latch

at the same time.

If the timer 2 write control bit is “1”, when the value is written in the

address of timer 2, the value is loaded only in the latch. The value

in the latch is loaded in timer 2 after timer 2 underflows.

Note on Timer 1 to Timer 3

When the count source of timer 1 to 3 is changed, the timer count-

ing value may be changed large because a thin pulse is generated

in count input of timer. If the count source of timer 2 or timer 3 is

connected to timer 1 output, when timer 1 is written, the counting

value of timer 2 or timer 3 may be changed large because a thin

pulse is generated in timer 1 output.

Therefore, set the value of timer in the order of timer 1 , timer 2

and timer 3 after the count source selection of timer 1 to 3.

b7

b0

Timer 123 mode register

(T123M : address 002916)

Not used (Always write “0” )

Timer 2 write control bit

0 : Write data in latch and timer

1 : Write data in latch only

Timer 2 count source selection bit

0 : Timer 1 output

1 : XIN/16

(or XCIN/16 when system clock φ = XCIN/2)

Timer 3 count source selection bit

0 : Timer 1 output

1 : XCIN/32

Timer 1 count source selection bit

0 : XIN/16

(or XCIN/16 when system clock φ = XCIN/2)

1 : XCIN/32

Not used (return “0” when read)

Fig. 12 Structure of timer 123 mode register

17

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