7702 datasheet(98/217 Pages) RENESAS

98 / 217 page

TIMER A

7702/7703 Group User’s Manual

5–10

5.3 Timer mode

Fig. 5.3.1 Structures of timer Ai mode register and timer Ai register in timer mode

b0 b7

(b15)

(b8)

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A3 register (Addresses 4D16, 4C16)

Timer A4 register (Addresses 4F16, 4E16)

Functions

Bit

At reset

15 to 0 These bits can be set to “000016” to “FFFF16.”

Assuming that the set value = n, the counter

divides the count source frequency by n + 1.

When reading, the register indicates the

counter value.

Undefined

Gate function select bits

Pulse output function select bit

Operating mode select bits

Bit name

Functions

b7 b6

b5 b4 b3 b2 b1 b0

Timer Ai mode register (i = 0 to 4) (Addresses 5616 to 5A16)

0 0 : Timer mode

0 : No pulse output

(TAiOUT pin functions as a programmable

I/O port.)

1 : Pulse output

(TAiOUT pin functions as a pulse output

pin.)

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b7 b6

Count source select bits

b1 b0

b4 b3

0 0 : No gate function

0 1 : (TAiIN pin functions as a prog-

rammable I/O port.)

1 0 : Gate function

(Counter counts only while TAiIN

pin’s input signal is “L” level.)

1 1 : Gate function

(Counter counts only while TAiIN

pin’s input signal is “H” level.)

Bit

At reset

Fix this bit to “0” in the timer mode.

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