HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 367

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

2. External Clock Operation: Set the TPSC2 to TPSC0 bits in TCR to select the external clock
3. On-Chip RTC Clock Operation: Set the TPSC2 to TPSC0 bits in TCR to select the on-chip
(TCLK) as the timer clock. Use the CKEG1 and CKEG0 bits in TCR to select the detection
edge. Rise, fall or both may be selected. The pulse width of the external clock must be at least
1.5 peripheral module clock cycles for single edges or 2.5 peripheral module clock cycles for
both edges. A shorter pulse width will result in accurate operation. Figure 12.5 shows the
timing for both-edge detection.
RTC clock as the timer clock. Figure 12.6 shows the timing.
pin (TCLK)
clock input
input clock
Figure 12.5 Count Timing when External Clock is Operating (Both Edges Detected)
RTC output
TCNT input
External
TCNT
TCNT
TCNT
clock
clock
P
Figure 12.6 Count Timing when On-Chip RTC Clock Is Operating
N + 1
N + 1
N
N
Rev. 4.00, 03/04, page 321 of 660
N – 1
N – 1