SH7708 datasheet(333/633 Pages) RENESAS

333 / 633 page

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External

clock input

TCNT

input clock

TCNT

N + 1

N – 1

Figure 11.5 Count Timing when External Clock Is Operating (Both Edges Detected)

• On-Chip RTC Clock Operation: Set the TPSC2–TPSC0 bits in TCR to select the on-chip RTC

clock as the timer clock. Figure 11.6 shows the timing.

RTC output

clock

TCNT

TCNT input

clock

N + 1

N – 1

Figure 11.6 Count Timing when On-Chip RTC Clock Is Operating

Input Capture Function: Channel 2 has an input capture function (figure 11.7). When using the

input capture function, set the TCLK pin to input mode with the TCOE bit in the timer output

control register (TOCR) and set the timer operation clock to internal clock or on-chip RTC clock

with the TPCS2–TPCS0 bits in the timer control register (TCR). Also, designate use of the input

capture function and whether to generate interrupts on using it with the IPCE1–IPCE0 bits in

TCR, and designate the use of either the rising or falling edge of the TCLK pin to set the timer

counter (TNCT) value into the input capture register (TCPR) with the CKEG1–CKEG0 bits in

TCR.

The input capture function cannot be used in standby mode.

SH7708 Datenblatt(PDF) 333 Page - Renesas Technology Corp