Operation; Basic Functions - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group
10.4

Operation

10.4.1

Basic Functions

Each channel has a TCNT and TGR register. TCNT performs up-counting, and is also capable of free-running operation,
cycle counting, and external event counting.
Each TGR can be used as an input capture register or output compare register.
Always select functions for external pins of this module using the general I/O ports.
(1) Counter Operation
When one of bits CST0 to CST4 in TSTR is set to 1, the TCNT counter for the corresponding channel begins counting.
TCNT can operate as a free-running counter, periodic counter, for example.
(a) Example of Count Operation Setting Procedure
Figure 10.4 shows an example of the count operation setting procedure.
Operation selection
Select counter clock
Select counter clearing
Select output compare
Start count operation
<Periodic counter>
Figure 10.4 Example of Counter Operation Setting Procedure
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
[1]
Free-running counter
Periodic counter
[2]
source
[3]
register
Set period
[4]
Start count operation
[5]
<Free-running counter>
10. Multi-Function Timer Pulse Unit 2
[1] Select the counter clock
with bits TPSC2 to TPSC0
in TCR. At the same time,
select the input clock edge
with bits CKEG1 and
CKEG0 in TCR.
[2] For periodic counter
operation, select the TGR
to be used as the TCNT
clearing source with bits
CCLR2 to CCLR0 in TCR.
[3] Designate the TGR
selected in [2] as an output
compare register by means
of TIOR.
[4] Set the periodic counter
cycle in the TGR selected
in [2].
[5]
[5] Set the CST bit in TSTR to
1 to start the counter
operation.
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