m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 132

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

7.5 One-shot pulse mode
In this mode, the timer outputs a pulse which has an arbitrary width once.
When a trigger occurs, the timer outputs “H” level from the TAi
the specifications of the one-shot pulse mode. Figure 7.5.1 shows the structures of the timer Ai register and
timer Ai mode register in the one-shot pulse mode.
Table 7.5.1 Specifications of one-shot pulse mode
Count source f
Count operation
Output pulse width (“H”)
Count start condition
Count stop condition
Interrupt request occurrence timing
TAi
TAi
Read from timer Ai register
Write to timer Ai register
Note: The trigger is generated with the count start bit = “1.”
IN
OUT
pin’s function
pin’s function
i
Item
f
When counting stops.
Programmable I/O port pin or trigger input pin
One-shot pulse output
An undefined value is read out.
1
, f
7905 Group User’s Manual Rev.1.0
Countdown
When the counter value becomes “0000
tents are reloaded, and counting stops.
If a trigger occurs during counting, reload register’s contents are
reloaded, and counting continues.
When a trigger occurs. (Note)
Internal or external trigger can be selected by software.
When the counter value becomes “0000
When the count start bit is cleared to “0”
While counting is stopped
When a value is written to timer Ai register, it is written to both of
the reload register and counter.
While counting is in progress
When a value is written to timer Ai register, it is written only to the
reload register. (Transferred to counter at the next reload timing.)
n
f
2
i
, f
16
[s]
, f
64
, f
n : Timer Ai register’s set value
512
, or f
4096
OUT
Specifications
pin for an arbitrary time. Table 7.5.1 lists
7.5 One-shot pulse mode
16
16
”
,” reload register’s con-
TIMER A
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