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RL78/G1A CHAPTER 6 TIMER ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 184
Jul 04, 2013
6.1 Functions of Timer Array Unit
Timer array unit has the following functions.
6.1.1 Independent channel operation function
By operating a channel independently, it can be used for the following purposes without being affected by the operation
mode of other channels.
(1) Interval timer
Each timer of a unit can be used as a reference timer that generates an interrupt (INTTMmn) at fixed intervals.
Interrupt signal
(INTTMmn)
Operation clock
Compare operation
Channel n
(2) Square wave output
A toggle operation is performed each time INTTMmn interrupt is generated and a square wave with a duty factor of
50% is output from a timer output pin (TOmn).
Timer output
(TOmn)
Operation clock
Compare operation
Channel n
(3) External event counter
Each timer of a unit can be used as an event counter that generates an interrupt when the number of the valid
edges of a signal input to the timer input pin (TImn) has reached a specific value.
Interrupt signal
(INTTMmn)
Edge detection
Timer input
(TImn)
Compare operation
Channel n
(4) Divider function (channel 0 only)
A clock input from a timer input pin (TI00) is divided and output from an output pin (TOm0).
Timer output
(TO00)
Timer input
(TI00)
Channel 0
Compare operation
(5) Input pulse interval measurement
Counting is started by the valid edge of a pulse signal input to a timer input pin (TImn). The count value of the
timer is captured at the valid edge of the next pulse. In this way, the interval of the input pulse can be measured.
Edge detection
Timer input
(TImn)
Capture
xxH
00H
Start
Channel n
Capture operation
(Note, Caution, and Remark are listed on the next page.)