7733 datasheet(532/940 Pages) RENESAS

532 / 940 page

EXTERNAL ROM VERSION

7733 Group User’s Manual

20–16

20.7 Timer A

Fig. 20.7.3 Structures of timer A0, A2 mode registers and timer A0, A2 registers in pulse output port

mode

X: It may be either “0” or “1.”

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 A0 mode register (address 56 16)

0 0: Timer mode

1: Pulse is output.

Must be fixed to “1.”

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 0:

0 1:

Bit

At reset

(b15)

(b8)

Timer A0 register (addresses 47 16, 4616)

Timer A2 register (addresses 4B 16, 4A16)

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

Timer A2 mode register (address 58 16)

No gate function

Bit 4 must be fixed to “0.”

0 !

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