One-Shot Pulse Mode - Renesas 7700 FAMILY User Manual

TIMER A

5.5 One-shot pulse mode

5.5 One-shot pulse mode
In this mode, the timer outputs a pulse which has an arbitrary width once. (Refer to Table 5.5.1.) When a
trigger occurs, the timer outputs "H" level from the TAi
structures of the timer Ai mode register and timer Ai register in the one-shot pulse mode.
Table 5.5.1 Specifications of one-shot pulse mode
Item
Count source
Count operation
Count start condition
Count stop condition
Interrupt request occurrence timing
TAi pin function
IN
TAi pin function
OUT
Read from timer Ai register
Write to timer Ai register
Note: The trigger is generated with the count start bit = "1."
5–30
OUT
f /f , f /f , f /f , or f
2 4 16 32 64 128
Down-count
When the counter value becomes "0000
tents are reloaded and counting stops.
If a trigger occurs during counting, reload register's contents are
reloaded then and counting continues.
When a trigger occurs. (Note)
Internal or external trigger can be selected by software.
When the counter value becomes "0000
When count start bit is cleared to "0"
When counting stops.
Programmable I/O port or trigger input
One-shot pulse output
An undefined value is read out.
While counting is stopped
When a value is written to timer Ai register, it is written to both
reload register and counter.
While counting is in progress
When a value is written to timer Ai register, it is written to only
reload register. (Transferred to counter at next reload time.)
7751 Group User's Manual
pin for an arbitrary time. Figure 5.5.1 shows the
Specifications
/f
512 1024
16
," reload register's con-
16
,
"