m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 117

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

TIMER A
7.3 Timer mode
Fig. 7.3.3 Example of operation in timer mode (without pulse output and gate functions)
7-14
7.3.2 Operation in timer mode
Figure 7.3.3 shows an example of operation in the timer mode.
set to “1” until the interrupt request is accepted or until the interrupt request bit is cleared to “0” by
software.
When a counter underflow occurs, the reload register’s contents are reloaded, and counting continues.
When the count start bit is set to “1,” the counter starts counting of the count source.
The timer Ai interrupt request bit is set to “1” at the underflow in
Timer Ai interrupt
Count start bit
request bit
FFFF
0000
n
16
16
f
n : Reload register’s contents
i
: Frequency of count source
Set to “1” by software.
Starts counting.
7905 Group User’s Manual Rev.1.0
Cleared to “0” when interrupt request is
accepted or cleared by software.
(1 / f
i
)
Cleared to “0” by software.
(n+1)
Stops counting.
. The interrupt request bit remains
Set to “1” by software.
Restarts counting.
Time