14. Timers - Renesas R8C/18 Series Hardware Manual

R8C/18 Group, R8C/19 Group

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
Configuration
Count
Count sources
Function Timer mode
Pulse output mode
Event counter mode
Pulse width measurement
mode
Pulse period measurement
mode
Programmable waveform
generation mode
Programmable one-shot
generation mode
Programmable wait one-
shot generation mode
Input capture mode
Output compare mode
Input pin
Output pin
Related interrupt
Timer stop
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
Timer X
8-bit timer with 8-bit
prescaler (with
reload register)
Decrement
• f1
• f2
• f8
• fRING
Provided
Provided
Provided
Provided
Provided
Not provided
Not provided
Not provided
Not provided
Not provided
CNTR0
CNTR0
CNTR0
Timer X interrupt
INT1 interrupt
Provided
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Timer Z
8-bit timer with 8-bit 16-bit free-run timer
prescaler (with (with input capture
reload register) and output compare)
Decrement Increment
• f1 • f1
• f2 • f8
• f8 • f32
• Timer X underflow • fRING-fast
Provided Not provided
Not provided Not provided
Not provided Not provided
Not provided Not provided
Not provided Not provided
Provided Not provided
Provided Not provided
Provided Not provided
Not provided Provided
Not provided Provided
TCIN
INT0
TZOUT CMP0_0 to CMP0_2
CMP1_0 to CMP1_2
Timer Z interrupt Timer C interrupt
INT0 interrupt INT3 interrupt
Compare 0 interrupt
Compare 1 interrupt
Provided Provided
14. Timers
Timer C