M38047FEHKP datasheet(163/387 Pages) RENESAS

163 / 387 page

2-39

APPLICATION

2.3 Timer

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

Fig. 2.3.23 Relevant registers setting

PRE12

64 – 1

PREY

8 – 1

1 – 1

255

ICON1

IREQ1

Timer Y interrupt: Disabled

Timer 1 interrupt: Enabled

Timer XY mode register (address 002316)

Timer Y operating mode: Event counter mode

Timer Y count: Stop

Clear to “0” when starting count

Prescaler 12 (address 002016)

Timer Y (address 002716)

Set “division ratio – 1”

Interrupt control register 1 (address 003E16)

CNTR1 active edge switch: Falling edge count

Prescaler Y (address 002616)

Timer 1 (address 002116)

Interrupt request register 1 (address 003C16)

Judgment of Timer Y interrupt request bit

( “1” of this bit when reading the count value indicates the 256 or more

pulses input in the condition of Timer Y = 255)

Set 255 just before counting pulses

(After a certain time has passed, the number of input

pulses is decreased from this value.)

T12XCSS

f(XIN)/32: select

Timer 12, X count source selection register (address 000E16)

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