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APPENDIX
Appendix 3. Control registers
One-shot pulse mode
(b15)
b7
b7
b6
b5
b4 b3
b2
0
1
20–22
(b8)
b0 b7
b1
b0
Timer Ai mode register (i = 0 to 4) (Addresses 56
1
0
Bit
Bit name
Operating mode select bits
0
1
@
Fix this bit to "1" in one-shot pulse mode.
2
3
Trigger select bits
4
5
Fix this bit to "0" in one-shot pulse mode.
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
Functions
15 to 0 These bits can be set to "0000
Assuming that the set value = n, the "H" level
width of the one-shot pulse output from the
TAi
pin is expressed as follows :
OUT
f
: Frequency of count source (f
i
b1 b0
1 0 : One-shot pulse mode
b4 b3
0 0 : Writing "1" to one-shot start register
0 1 : (TAi
IN
rammable I/O port.)
1 0 : Falling edge of TAi
1 1 : Rising edge of TAi
b7 b6
0 0 : f
/ f
2
4
0 1 : f
/ f
16
32
1 0 : f
/ f
64
128
1 1 : f
/ f
512
1024
, 46
)
16
16
, 48
)
16
16
, 4A
)
16
16
, 4C
)
16
16
, 4E
)
16
16
At reset
" to "FFFF
."
Undefined
16
16
n
f
.
i
/ f
, f
/ f
, f
/ f
, or f
/ f
2
4
16
32
64
128
512
1024
to 5A
)
16
16
Functions
At reset
pin functions as a prog-
pin's input signal
IN
pin's input signal
IN
0
0
RW
WO
)
RW
RW
0
0
RW
0
RW
RW
0
0
RW
RW
RW
0
RW
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