Section 11
Multi-Function Timer Pulse Unit 2 (MTU2)
Rev. 0.50 May 18, 2006 Page 499 of 1588
REJ09B0313-0050
11.4 Operation
11.4.1 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 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 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.
Figure 11.4 Example of Counter Operation Setting Procedure
Содержание Single-Chip Microcomputer SH7203
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