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SH7018 Datasheet(PDF) 147 Page - Renesas Technology Corp

Part # SH7018
Description  SuperH??RISC engine
PDF  431 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7018 Datasheet(HTML) 147 Page - Renesas Technology Corp

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8.4.4
Buffer Operation
Buffer operation is a function of channel 0. TGRC and TGRD can be used as buffer registers.
Table 8.5 shows the register combinations for buffer operation.
Table 8.5
Register Combinations
Channel
General Register
Buffer Register
0
TGR0A
TGR0C
TGR0B
TGR0D
The buffer operation differs, depending on whether the TGR has been set as an input capture
register or an output compare register.
When TGR Is an Output Compare Register: When a compare-match occurs, the corresponding
channel buffer register value is transferred to the general register. Figure 8.16 shows an example.
Compare match signal
Buffer
register
TCNT
Comparator
General
register
Figure 8.16 Compare Match Buffer Operation
When TGR Is an Input Capture Register: When an input capture occurs, the timer counter
(TCNT) value is transferred to the general register (TGR), and the value that had been held up to
that time in the TGR is transferred to the buffer register (figure 8.17).
Input capture signal
TCNT
Buffer
register
General
register
Figure 8.17 Input Capture Buffer Operation



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