SH7205 Datasheet, PDF (582/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 12 Multi-Function Timer Pulse Unit 2 (MTU2)
(1) Example of PWM Mode Setting Procedure
Figure 12.25 shows an example of the PWM mode setting procedure.
PWM mode
Select counter clock [1]
Select counter clearing [2]
source
Select waveform
[3]
output level
Set TGR
[4]
Set PWM mode
[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] Use bits CCLR2 to CCLR0 in TCR to select
the TGR to be used as the TCNT clearing
source.
[3] Use TIOR to designate the TGR as an output
compare register, and select the initial value
and output value.
[4] Set the cycle in the TGR selected in [2], and
set the duty in the other TGR.
[5] Select the PWM mode with bits MD3 to MD0
in TMDR.
[6] Set the CST bit in TSTR to 1 to start the
count operation.
Start count
[6]
<PWM mode>
Figure 12.25 Example of PWM Mode Setting Procedure
(2) Examples of PWM Mode Operation
Figure 12.26 shows an example of PWM mode 1 operation.
In this example, TGRA compare match is set as the TCNT clearing source, 0 is set for the TGRA
initial output value and output value, and 1 is set as the TGRB output value.
In this case, the value set in TGRA is used as the period, and the values set in the TGRB registers
are used as the duty levels.
Rev. 1.00 Mar. 25, 2008 Page 550 of 1868
REJ09B0372-0100