M38203M4 Datasheet, PDF (180/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.4 Timer 1, timer 2, and timer 3
sTOUT output active edge switch bit (bit 0)
The TOUT output active edge switch bit selects an initial level of the TOUT output.
When bit 0 is “0,” the output pulse from the P56/TOUT pin is started at the “H” level.
When bit 0 is “1,” the output pulse from the P56/TOUT pin is started at the “L” level.
sTOUT output control bit (bit 1)
The TOUT output control bit controls the TOUT output.
When bit 1 is “0,” the TOUT output is disabled.
When bit 1 is “1,” the TOUT output is enabled.
sTimer 2 write control bit (bit 2)
The timer 2 write control bit controls writing to the timer 2.
When bit 2 is “0,” a simultaneous write operation to both the timer 2 latch and the timer 2 counter is
set.
When a value is written to the timer 2, the value is set into both the timer 2 latch and the timer 2
counter at the same time.
When bit 2 is “1,” a write operation to the latch only is set.
When a value is written into the timer 2, the value is set into the timer 2 latch only.
When a value is written into the timer 2 latch only, this rewritten value is transferred to the timer 2
counter at the first timer 2 counter underflow after rewriting.
sTimer 2 count source selection bit (bit 3)
The timer 2 count source selection bit selects a count source of the timer 2. Table 2.4.1 shows the
relation between the timer 2 count source selection bit and count sources.
Table 2.4.1 Relation between timer 2 count source selection bit and count sources
bit 3
0
1
Timer 2 count source
Timer 1 underflow
f(XIN)/16 (In low speed mode; f(XCIN)/16)
sTimer 3 count source selection bit (bit 4)
The timer 3 count source selection bit selects a count source of the timer 3. Table 2.4.2 shows the
relation between the timer 3 count source selection bit and count sources.
Table 2.4.2 Relation between timer 3 count source selection bit and count sources
bit 4
0
1
Timer 3 count source
Timer 1 underflow
f(XIN)/16 (In low speed mode; f(XCIN)/16)
sTimer 1 count source selection bit (bit 5)
The timer 1 count source selection bit selects a count source of the timer 1. Table 2.4.3 shows the
relation between the timer 1 count source selection bit and count sources.
Table 2.4.3 Relation between timer 1 count source selection bit and count sources
bit 5
0
1
Timer 1 count source
f(XIN)/16 (In low speed mode; f(XCIN)/16)
f(XCIN)
Count source examples
f(XIN) = 8 MHz
500 kHz
—
f(XCIN) = 32.768 kHz
2.048 kHz
32.768 kHz
2–94
3820 GROUP USER’S MANUAL