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User’s Manual U11969EJ3V0UM00
175
CHAPTER 7 TIMER/COUNTER FUNCTION (REAL-TIME PULSE UNIT)
7.4.2 Count clock selection
An internal or external count clock frequency can be input to timer 0. Which count clock frequency is used is selected
by the PRM00 to PRM03 bits of the TMC00 register.
Caution
Do not change the count clock frequency while the timer operates.
(1) Internal count clock
An internal count clock frequency is selected by the PRM bit of the TMC00 register, from
φ
/2,
φ
/4,
φ
/8,
φ
/16,
φ
/32,
φ
/64,
φ
/128, and
φ
/256.
PRM03
PRM02
PRM01
PRM00
Internal Count Clock
0
0
0
1
φ
/2
0
0
1
0
φ
/4
0
0
1
1
φ
/8
0
1
0
0
φ
/16
0
1
0
1
φ
/32
0
1
1
0
φ
/64
0
1
1
1
φ
/128
1
0
0
0
φ
/256
(2) External count clock
The signal input to the TI0 pin is counted. At this time, timer 0 operates as an event counter.
To set an external count clock see the table as follows.
PRM03
PRM02
PRM01
PRM00
External Count Clock
1
1
1
1
TI0 input
The valid edge of TI0 is specified by the ES bit of the INTM2 register.
ES051
ES050
Valid Edge
0
0
Falling edge
0
1
Rising edge
1
0
RFU (reserved)
1
1
Both rising and falling edges
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