
R8C/14 Group, R8C/15 Group 13. Timers
Rev.2.10 Jan 19, 2006 Page 83 of 253
REJ09B0164-0210
13. Timers
The microcomputer contains two 8-bit timers with 8-bit prescaler and a 16-bit timer. The two 8-bit timers with
the 8-bit prescaler contain Timer X and Timer Z. These timers contain a reload register to memorize the
default value of the counter. The 16-bit timer is Timer C which contains the input capture and output
compare. All these 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 13.1 lists Functional Comparison of Timers.
Table 13.1 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 source •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 Y interrupt
INT0 interrupt
Timer C interrupt
INT3 interrupt
Compare 0 interrupt
Compare 1 interrupt
Timer Stop provided provided provided
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