7906 datasheet(115/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-12

7.3 Timer mode

Fig. 7.3.1 Structures of timer Ai register and timer Ai mode register in timer mode

Timer A0 register (Addresses 4716, 4616)

Timer A5 register (Addresses C716, C616)

Timer A1 register (Addresses 4916, 4816)

Timer A6 register (Addresses C916, C816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A7 register (Addresses CB16, CA16)

Timer A3 register (Addresses 4D16, 4C16)

Timer A8 register (Addresses CD16, CC16)

Timer A4 register (Addresses 4F16, 4E16)

Timer A9 register (Addresses CF16, CE16)

Undefined

15 to 0 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).

When reading, the register indicates the counter value.

(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

Gate function select bits

Fix this bit to “0” in timer mode.

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : Timer mode

b1 b0

0 0 :

No gate function

0 1 :

(TAjIN pin functions as a programmable I/O

port pin.)

1 0 :

Gate function

(Counter is active only while TAjIN pin’s in-

put signal is at “L” level.)

1 1 :

Gate function

(Counter is active only while TAjIN pin’s in-

put signal is at “H” level.)

b4 b3

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.)

See Table 7.2.3.

Bit name

Bit

Function

At reset

R/W

Bit

Function

At reset

R/W

5 to 2

Timer Ak mode register (k = 3, 5 to 8) (Addresses 5916, D616 to D916)

Operating mode select bits

Fix these bits to “0000” in timer mode.

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : Timer mode

b1 b0

See Table 7.2.3.

Bit name

Bit

Function

At reset

R/W

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