Rev. 3.0, 10/02, page 300 of 686
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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
Example of Buffer Operation Setting Procedure: Figure 10.18 shows an example of the buffer
operation setting procedure.
Buffer operation
Select TGR function
Set buffer operation
Start count
<Buffer operation>
[1]
[2]
[3]
[1]
[2]
[3]
Designate TGR as an input capture register or
output compare register by means of TIOR.
Designate TGR for buffer operation with bits
BFA and BFB in TMDR.
Set the CST bit in TSTR to 1 start the count
operation.
Figure 10.18 Example of Buffer Operation Setting Procedure
Examples of Buffer Operation
1. When TGR is an output compare register
Figure 10.19 shows an operation example in which PWM mode 1 has been designated for
channel 0, and buffer operation has been designated for TGRA and TGRC. The settings used in
this example are TCNT clearing by compare match B, 1 output at compare match A, and 0
output at compare match B. As buffer operation has been set, when compare match A occurs
the output changes and the value in buffer register TGRC is simultaneously transferred to timer
general register TGRA. This operation is repeated each time compare match A occurs. For
details of PWM modes, see section 10.5.4, PWM Modes.
Содержание H8S/2215 Series
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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