TIMER A
7.5 One-shot pulse mode
Timer A0 register (Addresses 4716, 4616)
Timer A1 register (Addresses 4916, 4816)
Timer A2 register (Addresses 4B16, 4A16)
Timer A4 register (Addresses 4F16, 4E16)
Timer A9 register (Addresses CF16, CE16)
(b8)
b0 b7
(b15)
b7
b0
Bit
Function
At reset R/W
15 to 0 Any value in the range from “000016” to “FFFF16” can be set.
Assuming that the set value = n, the “H” level width of the one-shot pulse which is
Undefined WO
output from the TAjOUT pin is expressed as follows :
n
fi.
fi: Frequency of count source
Note: Use the MOVM or STA(STAD) instruction for writing to this register.
Writing to this register must be performed in a unit of 16 bits.
b7 b6 b5 b4 b3 b2 b1 b0
Timer Aj mode register (j = 0 to 2, 4, 9) (Addresses 5616 to 5816, 5A16, DA16)
0
1 1 0
Bit
0
Bit name
Function
1 0 : One-shot pulse mode
At reset R/W
b1 b0
0
0
0
0
RW
RW
RW
RW
Operating mode select bits
1
2
3
Fix this bit to “1” in one-shot pulse mode.
b4 b3
Trigger select bits
0 0 :
0 1 :
Writing “1” to one-shot start bit
(TAjIN pin functions as a programmable I/O
port pin.)
4
0
RW
1 0 : Falling edge of TAjIN pin’s input signal
1 1 : Rising edge of TAjIN pin’s input signal
5
6
Fix this bit to “0” in one-shot pulse mode.
See Table 7.2.3.
0
0
RW
RW
Count source select bits
7
0
RW
Fig. 7.5.1 Structures of timer Aj register and timer Aj mode register in one-shot pulse mode
7906 Group User’s Manual Rev.2.0
7-30
RENESAS [ RENESAS TECHNOLOGY CORP ]
