TIMER A
7.5 One-shot pulse mode
7.5.1 Setting for one-shot pulse mode
Figures 7.5.2 and 7.5.3 show an initial setting example for registers related to the one-shot pulse mode.
Note that when using interrupts, set up to enable the interrupts. For details, refer to “CHAPTER 6.
INTERRUPTS.”
Selecting one-shot pulse mode and each function
b7
b0
Timer Aj mode register (j = 0 to 2, 4, 9)
0
1 1 0
(Addresses 5616 to 5816, 5A16, DA16
)
Selection of one-shot pulse mode
Trigger select bits
b4 b3
0 0 :
0 1 :
Writing “1” to one-shot start bit: Internal trigger
1 0 : Falling of TAjIN pin’s input signal: External trigger
1 1 : Rising of TAjIN pin’s input signal: External trigger
Count source select bits
See Table 7.2.3.
Setting “H” level width of one-shot pulse
Timer A0 register (Addresses 4716, 4616
Timer A1 register (Addresses 4916, 4816
)
)
(b15)
(b8)
b0 b7
b7
b0
Timer A2 register (Addresses 4B16, 4A16
Timer A4 register (Addresses 4F16, 4E16
Timer A9 register (Addresses CF16, CE16
)
)
)
Can be set to “000016” to “FFFF16” (n).
n
“H” level width =
Note.
fi
fi = Frequency of count source
However, if n = “000016”, the counter does not operate and the
TAjOUT pin outputs “L” level. At this time, no timer Aj interrupt
request occurs.
Setting interrupt priority level
b7
b0
Timer Aj interrupt control register (j = 0 to 2, 4, 9)
(Addresses 7516 to 7716, 7916, F916
)
Interrupt priority level select bits
When using interrupts, set these bits to one of levels 1 to 7.
When disabling interrupts, set these bits to level 0.
Continued to Figure 7.5.3
on the next page
Fig. 7.5.2 Initial setting example for registers related to one-shot pulse mode (1)
7906 Group User’s Manual Rev.2.0
7-31
RENESAS [ RENESAS TECHNOLOGY CORP ]
