Renesas R5S72621 User Manual

 

Section 11   Multi-Function Timer Pulse Unit 2 

 

R01UH0134EJ0400  Rev. 4.00  

 

Page 507 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

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. 

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. 

Figure 11.4 shows an example of the count operation setting procedure. 

Operation selection

Select counter clock

Periodic counter

Select counter clearing

source

Select output compare

register

Set period

Free-running counter

Start count operation

<Free-running counter>

<Periodic  counter>

Start count operation

[1]

[2]

[3]

[4]

[5]

[5]

[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]  Set the CST bit in TSTR to 

1 to start the counter 
operation.