7477 datasheet(18/48 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

7477/ 7478 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Fig. 7 Structure of timer mode registers

Timer 12 mode register (T12M)

(Address 00F816)

Timer 1 count stop bit

0 : Count start

1 : Count stop

Timer 1 count source selection bit

0 : Internal clock (Note 1)

1 : P32/CNTR0 external clock

Timer 1 internal clock source

selection bit (Note 2)

0 : f(XIN) divided by 16 or

f(XCIN) divided by 16

1 : f(XCIN)

P12/T0 port output selection bit

0 : P12 port output

1 : Timer 1 overflow divided by 2

Timer 2 count stop bit

0 : Count start

1 : Count stop

Timer 2 count source selection bit

0 : Internal clock

1 : Timer 1 overflow

Timer 2 internal clock source

selection bits (Note 3)

00 : f(XIN) divided by 16 or

f(XCIN) divided by 16

01 : f(XIN) divided by 64 or

f(XCIN) divided by 64

10 : f(XIN) divided by 128 or

f(XCIN) divided by 128

11 : f(XIN) divided by 256 or

f(XCIN) divided by 256

Timer mode register 2 (TM2)

(Address 00FA16)

Timer 1 overflow FF set enable bit

0 : Set disable

1 : Set enable

Timer 4 overflow FF set enable bit

0 : Set disable

1 : Set enable

Nothing is allocated

(The value is undefined at reading)

Timer 3, timer 4 count overflow signal

selection bit

0 : Timer 1 overflow

1 : Timer 2 overflow

Timer 3, timer 4 function selection bit

0 : Normal mode

1 : PWM mode

Timer 34 mode register (T34M)

(Address 00F916)

Timer 3 count stop bit

0 : Count start

1 : Count stop

Timer 3 count source selection bits (Note 3)

00 : f(XIN) divided by 16 or

f(XCIN) divided by 16

01 : f(XCIN)

10 : Timer 1 overflow or timer 2 overflow

11 : P33/CNTR1 external clock

Timer 4 count stop bit

0 : Count start

1 : Count stop

Timer 4 count source selection bits (Note 3)

00 : Timer 3 overflow

01 : f(XIN) divided by 16 or

f(XCIN) divided by 16

10 : Timer 1 overflow or timer 2 overflow

11 : P33/CNTR1 external clock

Timer 4 pulse width measuring mode

selection bit

0 : Timer mode

1 : Pulse width measuring mode

P13/T1 port output selection bit

0 : P13 port output

1 : Timer 4 overflow divided by 2

or PWM output

Notes 1 : f(XIN) divided by 16 in the 7477 group.

2 : The 7477 group does not use this bit (bit 2). Set this bit to “0”.

3 : Do not select f(XCIN) as the count source in the 7477 group.

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