SH7101 datasheet(404/560 Pages) RENESAS

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Section 13 Motor Management Timer (MMT)

Rev.1.00 Sep. 18, 2008 Page 370 of 522

REJ09B0069-0100

13.4.1

Sample Setting Procedure

An example of the operating mode setting procedure is shown in figure 13.2.

Halt count operation

Set TCNT

Set TBR

Set PWM output level

Set operating mode

Set external pin functions

Start count operation

Set dead time carrier period

Clear the CST bit to 0 in the timer control register

(TCNR) to halt timer counter operation. Make the

operating mode setting while TCNT is halted.

Set 2Td (Td: dead time) in TCNT.

Set the output PWM duty cycle {PWM duty cycle

initial value – Td} in the free operation addresses of

the buffer registers (TBRU, TBRV, TBRW).

Set dead time Td in the dead time data register

(TDDR), set 1/2 the carrier period in the timer period

buffer register (TPBR), and set {TPBR value + 2Td}

in the timer period data register (TPDR).

Set the PWM output level with bits OLSN and OLSP

in the timer mode register (TMDR).

Set the operating mode in the timer mode register

(TMDR). The PUOA, PUOB, PVOA, PVOB, PWOA,

and PWOB pins are output pins.

Set the external pin functions with the pin function

controller (PFC).

Set the CST bit to 1 in TCNR to start the count

operation.

Figure 13.2 Sample Operating Mode Setting Procedure

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