7540 datasheet(91/366 Pages) RENESAS

91 / 366 page

2-15

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.2 Timer A

Fig. 2.2.4 Structure of Timer A mode register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Timer A mode register (TAM) [Address : 1D 16]

Timer A mode register

0 0 : Timer mode

0 1 : Period measurement mode

1 0 : Event counter mode

1 1 : Pulse width HL continuously

measurement mode

b5 b4

Timer A operating mode bits

CNTR1 active edge switch bit

The function depends on the

operating mode.

(Refer to Table 2.2.1)

Timer A count stop bit

0 : Count start

1 : Count stop

Nothing is allocated for these bits. These are write disabled bits.

When these bits are read out, the values are “0”.

Timer A operating modes

Timer mode

Period measurement mode

Event counter mode

Pulse w idth HL continuously

measurement mode

CNTR1 active edge switch bit (bit 6 of address 1D16) contents

“0” CNTR1 interrupt request occurrence: Falling edge

; No influence to timer count

“1” CNTR1 interrupt request occurrence: Rising edge

; No influence to timer count

“0” Period measurement: Falling period measurement

CNTR1 interrupt request occurrence: Falling edge

“1” Period measurement: Rising period measurement

CNTR1 interrupt request occurrence: Rising edge

“0” Timer A: Rising edge count

CNTR1 interrupt request occurrence: Falling edge

“1” Timer A: Falling edge count

CNTR1 interrupt request occurrence: Rising edge

“0” CNTR1 interrupt request occurrence: Rising edge and Falling edge

“1” CNTR1 interrupt request occurrence: Rising edge and Falling edge

Table 2.2.1 CNTR1 active edge switch bit function

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