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SH7721 Datasheet(PDF) 569 Page - Renesas Technology Corp

Part # SH7721
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  1524 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7721 Datasheet(HTML) 569 Page - Renesas Technology Corp

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Section 14 Timer Unit (TMU)
Rev. 3.00 Jan. 18, 2008 Page 507 of 1458
REJ09B0033-0300
(3)
TCNT Count Timing
1. Internal clock
Set the bits TPSC2 to TPSC0 in TCR to select one of the four internal clocks created by
dividing a peripheral module clock (P
φ/4, Pφ/16, Pφ/64, Pφ/256). Figure 14.4 shows the
timing.
P
φ
Divided
clock
TCNT
input clock
TCNT
N + 1
N
N – 1
Figure 14.4 Count Timing when Internal Clock is Operating
2. Internal RTC clock
Set the bits TPSC2 to TPSC0 in TCR to select the RTC output clock as a clock for timer.
Figure 14.5 shows the timing.
TCNT input
clock
N
N+1
N-1
RTC output
clock
TCNT
Figure 14.5 Count Timing when RTC Clock is Operating



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