Rev.6.00 Oct.28.2004 page 379
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REJ09B0138-0600H
10.4.4
Buffer Operation
Buffer operation, provided for channels 0 and 3, enables TGRC and TGRD to be used as buffer registers.
Buffer operation differs depending on whether TGR has been designated as an input capture register or as a compare
match register.
Table 10-5 shows the register combinations used in buffer operation.
Table 10-5 Register Combinations in Buffer Operation
Channel
Timer General Register
Buffer Register
0
TGR0A
TGR0C
TGR0B
TGR0D
3
TGR3A
TGR3C
TGR3B
TGR3D
•
When TGR is an output compare register
When a compare match occurs, the value in the buffer register for the corresponding channel is transferred to the timer
general register.
This operation is illustrated in figure 10-16.
Buffer register
Timer general
register
TCNT
Comparator
Compare match signal
Figure 10-16 Compare Match Buffer Operation
•
When TGR is an input capture register
When input capture occurs, the value in TCNT is transferred to TGR and the value previously held in the timer general
register is transferred to the buffer register.
This operation is illustrated in figure 10-17.
Buffer register
Timer general
register
TCNT
Input capture
signal
Figure 10-17 Input Capture Buffer Operation
Содержание ZTAT H8S/2357F
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