CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
User’s Manual U18172EJ2V0UD
92
Figure 6-10. Format of Port Mode Control Register 2 (PMC2)
Address: FF84H After reset: 00H R/W
7 6 5 4 3 2 1 0
0 0 0 0
PMC23
PMC22
PMC21
PMC20
PMC2n
Specification of operation mode (n = 0 to 3)
0
Port/Alternate-function (except A/D converter) mode
Symbol
PMC2
1
A/D converter mode
6.4 Operation of 16-Bit Timer/Event Counter 00
6.4.1 Interval
timer
operation
Setting 16-bit timer mode control register 00 (TMC00) and capture/compare control register 00 (CRC00) as shown
in Figure 6-11 allows operation as an interval timer.
Setting
The basic operation setting procedure is as follows.
<1> Set the CRC00 register (see
Figure 6-11
for the set value).
<2> Set any value to the CR000 register.
<3> Set the count clock by using the PRM00 register.
<4> Set the TMC00 register to start the operation (see
Figure 6-11
for the set value).
Caution Changing the CR000 setting during TM00 operation may cause a malfunction. To change the
setting, refer to 6.5 Cautions Related to 16-Bit Timer/Event Counter 00 (17) Changing compare
register during timer operation.
Remark
For how to enable the INTTM000 interrupt, see
CHAPTER 10 INTERRUPT FUNCTIONS
.
Interrupt requests are generated repeatedly using the count value set in 16-bit timer capture/compare register 000
(CR000) beforehand as the interval.
When the count value of 16-bit timer counter 00 (TM00) matches the value set to CR000, counting continues with
the TM00 value cleared to 0 and the interrupt request signal (INTTM000) is generated.
The count clock of the 16-bit timer/event counter can be selected using bits 0 and 1 (PRM000, PRM001) of
prescaler mode register 00 (PRM00).