3822 datasheet(38/328 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

3822 Group

Timer Y

Timer Y is a 16-bit timer that can be selected in one of four modes.

Timer mode

The timer counts f(XIN)/16 (or f(XCIN)/16 in low-speed mode).

Period measurement mode

CNTR1 interrupt request is generated at rising/falling edge of

CNTR1 pin input signal. Simultaneously, the value in timer Y latch

is reloaded in timer Y and timer Y continues counting down/Except

for the above-mentioned, the operation in period measurement

mode is the same as in timer mode.

The timer value just before the reloading at rising/falling of CNTR1

pin input signal is retained until the timer Y is read once after the

reload.

The rising/falling timing of CNTR1 pin input signal is found by

CNTR1 interrupt. When using a timer in this mode, set the corre-

sponding port P55 direction register to input mode.

Event counter mode

The timer counts signals input through the CNTR1 pin.

Except for this, the operation in event counter mode is the same

as in timer mode. When using a timer in this mode, set the corre-

sponding port P55 direction register to input mode.

Pulse width HL continuously measurement mode

CNTR1 interrupt request is generated at both rising and falling

edges of CNTR1 pin input signal. Except for this, the operation in

pulse width HL continuously measurement mode is the same as in

period measurement mode. When using a timer in this mode, set

the corresponding port P55 direction register to input mode.

Note on CNTR1 Interrupt Active Edge Selec-

tion

CNTR1 interrupt active edge depends on the CNTR1 active edge

switch bit. However, in pulse width HL continuously measurement

mode, CNTR1 interrupt request is generated at both rising and

falling edges of CNTR1 pin input signal regardless of the setting of

CNTR1 active edge switch bit.

Fig. 19 Structure of timer Y mode register

Timer Y mode register

(TYM : address 002816)

Not used (return “0” when read)

Timer Y operating mode bits

b5 b4

0 : Timer mode

1 : Period measurement mode

0 : Event counter mode

1 : Pulse width HL continuously

measurement mode

CNTR1 active edge switch bit

0 : Count at rising edge in event counter mode

Measure the falling edge to falling edge

period in period measurement mode

Falling edge active for CNTR 1 interrupt

1 : Count at falling edge in event counter mode

Measure the rising edge period in period

measurement mode

Rising edge active for CNTR1 interrupt

Timer Y stop control bit

0 : Count start

1 : Count stop

3822 Datasheet(PDF) 38 Page - Renesas Technology Corp

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