m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 162

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

Fig. 8.3.3 Example of operation in timer mode
8.3.2 Operation in timer mode
Figure 8.3.3 shows an example of operation in the timer mode.
remains set to “1” until the interrupt request is accepted or until the interrupt request bit is cleared to
“0” by software.
When the count start bit is set to “1,” the counter starts counting of the count source.
When a counter underflow occurs, the reload register’s contents are reloaded and counting continues.
The timer Bi interrupt request bit is set to “1” at the counter underflow in
Timer Bi interrupt
Count start bit
request bit
FFFF
0000
f
n : Reload register’s contents
i
: Frequency of count source
n
16
16
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.
Set to “1” by software.
Restarts counting.
. The interrupt request bit
8.3 Timer mode
TIMER B
Time
8-11