7641 datasheet(148/385 Pages) RENESAS

148 / 385 page

Rev.2.00

Aug 28, 2006

page 17 of 148

7641 Group

REJ09B0336-0200

APPLICATION

2.2 Timer

Fig. 2.2.7 Structure of Timer Y mode register

Timer Y mode register

b7 b6 b5 b4 b3 b2 b1 b0

Timer Y mode register

(TYM : address 2816)

Name

Functions

At reset R W

Timer Y count source

select bits

CNTR1 active edge switch

bit

Timer Y count stop bit

Timer Y output control bit

0 : Write value in latch and counter

1 : Write value in latch only

b3b2

0 0 :

φ / 8

0 1 :

φ / 16

1 0 :

φ / 32

1 1 :

φ / 64

0 : TYOUT output disabled

1 : TYOUT output enabled

This function depends on the timer Y

operating mode. (See below.)

0 : Count start

1 : Count stop

Timer Y operating mode

bits

Timer Y write control bit

b5b4

0 0 : Timer mode

0 1 : Period measurement mode

1 0 : Event counter mode

1 1 : Pulse width HL continuously

measurement mode

Timer Y operating mode

CNTR1 active edge switch bit

Period measurement mode 0 : Measures between falling edges

1 : Measures between rising edges

Event counter mode

0 : Counts at rising edge

1 : Counts at falling edge

TYOUT output

0 : Starts at “H” output

1 : Starts at “L” output

Interrupt

0 : Falling edge active

1 : Rising edge active

Function of CNTR1 active edge switch bit

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