D12320VF25V Datasheet, PDF (386/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 16-Bit Timer Pulse Unit (TPU)
• 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 9.17.
Input capture
signal
Buffer register
Timer general
register
TCNT
Figure 9.17 Input Capture Buffer Operation
Example of Buffer Operation Setting Procedure: Figure 9.18 shows an example of the buffer
operation setting procedure.
Buffer operation
Select TGR function
Set buffer operation
[1] Designate TGR as an input capture register or
output compare register by means of TIOR.
[2] Designate TGR for buffer operation with bits
[1]
BFA and BFB in TMDR.
[3] Set the CST bit in TSTR to 1 to start the count
[2]
operation.
Start count
[3]
<Buffer operation>
Figure 9.18 Example of Buffer Operation Setting Procedure
Rev.7.00 Feb. 14, 2007 page 352 of 1108
REJ09B0089-0700