Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  6   TIMER  ARRAY  UNIT 

R01UH0305EJ0200  Rev.2.00 

 

 

184  

Jul 04, 2013 

 

Timer array unit has the following functions. 

 

By operating a channel independently, it can be used for the following purposes without being affected by the operation 

mode of other channels. 

 

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

 

 

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

 

 

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

 

 

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

 

 

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.)