7721 datasheet(482/577 Pages) RENESAS

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APPENDIX

Appendix 3. Control registers

7721 Group User’s Manual

17–19

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 “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

b4 b3 b2

b1 b0

Timer Aj mode register (j = 2 to 4) (Addresses 5816 to 5A16)

0 0 : Timer mode

0 : No pulse output

(TAjOUT pin functions as a programmable

I/O port.)

1 : Pulse output

(TAjOUT 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 :

(TAjIN pin functions as a prog-

rammable I/O port.)

1 0 : Counter counts only while TAjIN

pin’s input signal is at “L” level.

1 1 : Counter counts only while TAjIN

pin’s input signal is at “H” level.

Bit

At reset

Fix this bit to “0” in timer mode.

Bit

Bit name

At reset

Functions

Timer A0 mode register (Address 5616)

Timer A1 mode register (Address 5716)

Fix these bits to “0.”

Note: Read from or write to this register in a unit of 16 bits.

00 00 0 0

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b7 b6

Count source select bits

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