R5F72115D160FPV datasheet(464/1228 Pages) RENESAS

464 / 1228 page

Section 10 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 2.00 May. 08, 2008 Page 440 of 1200

REJ09B0344-0200

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 MTU2 external pins set function using the pin function controller (PFC).

(1)

Counter Operation

When one of bits CST0 to CST4 in TSTR or bits CSTU5, CSTV5, and CSTW5 in TSTR_5 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

Periodic counter

Select counter clearing

source

Select output compare

Set period

Free-running counter

Start count operation

<Free-running counter>

Start count operation

[1]

[2]

[3]

[4]

[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.

Figure 10.4 Example of Counter Operation Setting Procedure

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