m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 126

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

Fig. 7.4.4 Example of operation in event counter mode (without pulse output and two-phase pulse
7.4.2 Operation in event counter mode
Figure 7.4.4 shows an example of operation in the event counter mode.
When a counter underflow or overflow occurs, the reload register’s contents are reloaded, and counting
When the count start bit is set to “1,” the counter starts counting of the count source’s valid edge.
continues.
The timer Ai interrupt request bit is set to “1” at the underflow or overflow in
The interrupt request bit remains set to “1” until the interrupt request is accepted or until the interrupt
request bit is cleared to “0” by software.
Timer Ai interrupt
Count start bit
signal processing functions)
Up-down bit
request bit
Note: The above applies when the up-down bit’s contents are selected as the up-down switching factor (i.e., up-down
n : Reload register’s contents
FFFF
0000
switching factor select bit = “0” ).
16
16
n
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.
Set to “1” by software.
7.4 Event counter mode
.
TIMER A
Time
7-23