R8C/1A Group, R8C/1B Group 14. Timers
Rev.1.30 Dec 08, 2006 Page 108 of 315
REJ09B0252-0130
14. Timers
The MCU has two 8-bit timers with 8-bit prescalers, and a 16-bit timer. The two 8-bit timers with 8-bit prescalers are
timer X and timer Z. These timers contain a reload register to store the default value of the counter. The 16-bit timer is
timer C, and has input capture and output compare functions. All the timers operate independently. The count source
for each timer is the operating clock that regulates the timing of timer operations such as counting and reloading.
Table 14.1 lists Functional Comparison of Timers.
Table 14.1 Functional Comparison of Timers
Item Timer X Timer Z Timer C
Configuration 8-bit timer with 8-bit
prescaler (with
reload register)
8-bit timer with 8-bit
prescaler (with
reload register)
16-bit free-run timer
(with input capture
and output compare)
Count Decrement Decrement Increment
Count sources • f1
•f2
•f8
•fRING
•f1
•f2
•f8
• Timer X underflow
•f1
•f8
•f32
•fRING-fast
Function Timer mode Provided Provided Not provided
Pulse output mode Provided Not provided Not provided
Event counter mode Provided Not provided Not provided
Pulse width measurement
mode
Provided Not provided Not provided
Pulse period measurement
mode
Provided Not provided Not provided
Programmable waveform
generation mode
Not provided Provided Not provided
Programmable one-shot
generation mode
Not provided Provided Not provided
Programmable wait one-
shot generation mode
Not provided Provided Not provided
Input capture mode Not provided Not provided Provided
Output compare mode Not provided Not provided Provided
Input pin CNTR0
INT0
TCIN
Output pin CNTR0
CNTR0
TZOUT CMP0_0 to CMP0_2
CMP1_0 to CMP1_2
Related interrupt Timer X interrupt
INT1
interrupt
Timer Z interrupt
INT0 interrupt
Timer C interrupt
INT3 interrupt
Compare 0 interrupt
Compare 1 interrupt
Timer stop Provided Provided Provided
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