7906 datasheet(427/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

APPENDIX

20-22

Appendix 2. Control registers

s Event counter mode

15 to 0

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

Timer A9 register (Addresses CF16, CE16)

(b15)

(b8)

Timer Aj mode register (j = 0 to 2, 4, 9) (Addresses 5616 to 5816, 5A16, DA16)

Operating mode select bits

Pulse output function select bit

Count polarity select bit

Up-down switching factor select

bit

Fix this bit to “0” in event counter mode.

These bits are invalid in event counter mode.

b7 b6 b5 b4 b3 b2 b1 b0

0 1 : Event counter mode

b1 b0

0 : No pulse output (TAjOUT pin functions as a

programmable I/O port pin.)

1 : Pulse output (TAjOUT pin functions as a pulse

output pin.)

X : It may be either “0” or “1.”

XX 0

0 : Counts at falling edge of external signal

1 : Counts at rising edge of external signal

0 : Contents of up-down register

1 : Input signal to TAjOUT pin

Bit

Function

At reset

R/W

Bit name

Bit

Function

At reset

R/W

Undefined

Any value in the range from “000016” to “FFFF16” can be set.

Assuming that the set value = n, the counter divides the count source frequency by (n + 1)

during countdown, or by (FFFF16 – n + 1) during countup.

When reading, the register indicates the counter value.

Note: Reading from or writing to this register must be performed in a unit of 16 bits.

Reference

7-20

Reference

7-20

7-26

7-20

7-24

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