347
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
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