SH7101 datasheet(269/560 Pages) RENESAS

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Section 8 Multifunction Timer Pulse Unit (MTU)

Rev.1.00 Sep. 18, 2008 Page 235 of 522

REJ09B0069-0100

8.8.4

Overview of Initialization Procedures and Mode Transitions in Case of Error

during Operation, etc.

• When making a transition to a mode (Normal, PWM1, PWM2, PCM) in which the pin output

level is selected by the timer I/O control register (TIOR) setting, initialize the pins by means of

a TIOR setting.

• In PWM mode 1, since a waveform is not output to the TIOC*B (TIOC *D) pin, setting TIOR

will not initialize the pins. If initialization is required, carry it out in normal mode, then switch

to PWM mode 1.

• In PWM mode 2, since a waveform is not output to the cycle register pin, setting TIOR will

not initialize the pins. If initialization is required, carry it out in normal mode, then switch to

PWM mode 2.

• In normal mode or PWM mode 2, if TGRC and TGRD operate as buffer registers, setting

TIOR will not initialize the buffer register pins. If initialization is required, clear buffer mode,

carry out initialization, and then set buffer mode again.

• In PWM mode 1, if either TGRC or TGRD operates as a buffer register, setting TIOR will not

initialize the TGRC pin. To initialize the TGRC pin, clear buffer mode, carry out initialization,

then set buffer mode again.

• When making a transition to a mode (CPWM, RPWM) in which the pin output level is

selected by the timer output control register (TOCR) setting, switch to normal mode and

perform initialization with TIOR, then restore TIOR to its initial value, and temporarily disable

channel 3 and 4 output with the timer output master enable register (TOER). Then operate the

unit in accordance with the mode setting procedure (TOCR setting, TMDR setting, TOER

setting).

Pin initialization procedures are described below for the numbered combinations in table 8.43. The

active level is assumed to be low.

Note:

Channel number is substituted for * indicated in this article.

SH7101 Datasheet(PDF) 269 Page - Renesas Technology Corp