7751 datasheet(91/540 Pages) RENESAS

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TIMER A

7751 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

(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 “0000 16” 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/f4

0 1 : f16/f32

1 0 : f64/f128

1 1 : f512/f1024

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 TAi IN

pin’s input signal is “L” level.)

1 1 : Gate function

(Counter counts only while TAi IN

pin’s input signal is “H” level.)

Bit

At reset

0RW

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

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