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APPENDIX
Appendix 3. Control registers
Timer Mode
(b15)
b7
b7 b6 b5
b4 b3
b2 b1 b0
0
20–20
(b8)
b0 b7
0
0
Timer Ai mode register (i = 0 to 4) (Addresses 56
Bit
0
Operating mode select bits
1
2
Pulse output function select bit
Gate function select bits
3
4
Fix this bit to "0" in the timer mode.
5
Count source select bits
6
7
7751 Group User's Manual
Timer A0 register (Addresses 47
b0
Timer A1 register (Addresses 49
Timer A2 register (Addresses 4B
Timer A3 register (Addresses 4D
Timer A4 register (Addresses 4F
Bit
15 to 0 These bits can be set to "0000
Assuming that the set value = n, the counter
divides the count source frequency by n + 1.
When reading, the register indicates the
counter value.
Bit name
b1 b0
0 0 : Timer mode
0 : No pulse output
(TAi
I/O port.)
1 : Pulse output
(TAi
pin.)
b4 b3
0 0 : No gate function
0 1 : (TAi
1 0 : Counter counts only while TAi
1 1 : Counter counts only while TAi
b7 b6
0 0 : f
2
0 1 : f
16
1 0 : f
64
1 1 : f
512
, 46
)
16
16
, 48
)
16
16
, 4A
)
16
16
, 4C
16
16
, 4E
)
16
16
Functions
" to "FFFF
16
16
to 5A
)
16
16
Functions
pin functions as a programmable
OUT
pin functions as a pulse output
OUT
pin functions as a prog-
IN
rammable I/O port.)
pin's input signal is "L" level.
pin's input signal is "H" level.
/ f
4
/ f
32
/ f
128
/ f
1024
)
RW
At reset
RW
."
Undefined
RW
At reset
0
RW
0
RW
0
RW
0
RW
IN
0
RW
IN
RW
0
0
RW
0
RW
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