Chapter 9
16-bit Timer
Interval Timer IX - 39
9.4 Interval Timer
9.4.1 Interval Timer Function Operation
Interval timer function is the function which can generate the interrupts repeatedly at regular time intervals.
■ Clock Source Selection
The generation cycle of timer interrupts is set in advance by the clock source selection and the setting value of the
base register (TMnBR). The clock source can be selected by the timer as below.
Table:9.4.1 Clock Source at Timer Operating and 1 Count Time
*1 count time is calculated with the oscillation frequency as 10 MHz, 6 multiplication and IOCLK/=MCLK/2.
Clock source 1 count time Timer 8 Timer 9 Timer 10 Timer 11
IOCLK 33.3 ns O O O O
IOCLK/8266.7 nsOOOO
IOCLK/64 2.1 µsO O - -
Timer underflow - Timer 2 Timer 3 Timer 0
Timer 1
Timer 4
Timer 5
Pin output - TM8BIO TM9BIO TM10BIO TM11IO1
Clock source 1 count time Timer 12 Timer 13
IOCLK 33.3 ns O O
IOCLK/8 266.7 ns O O
MCLK 16.7 ns O O
MCLK/8 133.3 ns O O
Timer underflow - Timer 6
Timer 1
Timer 6
Timer 7
Pin output - - -
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