7733 datasheet(567/940 Pages) RENESAS

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APPENDIX

7733 Group User’s Manual

21-19

Appendix 3. Control registers

sTimer mode

Clocks f2, f16, f64, and f512: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Gate function selection bits

Pulse output function

selection bit

Operating mode selection

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 is output.

(Pin TAiOUT functions as a programmable

I/O port.)

1: Pulse is output.

(Pin TAiOUT functions as a pulse output

pin.)

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

b7 b6

Count source selection bits

b1 b0

b4 b3

Must be fixed to “0” in the timer mode.

0 X: No gate function

(Pin TAiIN functions as a programmable

I/O port.)

1 0: Counter counts only while pin TAiIN’s

input signal level is “L.”

1 1: Counter counts only while pin TAiIN’s

input signal level is “H.”

Bit

At reset

(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 Values 000016 to FFFF16 can be set.

Assuming that the set value = n, counter

divides the count source frequency by (n + 1).

At reading this register, the counter value is

read out.

Undefined

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