SH7014 datasheet(307/754 Pages) RENESAS

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10. Multifunction Timer Pulse Unit (MTU)

Rev.5.00 Sep. 27, 2007 Page 273 of 716

REJ09B0398-0500

10.8

MTU Output Pin Initialization

10.8.1

Operating Modes

The MTU has the following four operating modes. Waveform output is possible in all of these

modes.

• Normal mode (channels 0 to 2)

• PWM mode 1 (channels 0 to 2)

• PWM mode 2 (channels 0 to 2)

• Phase counting modes 1 to 4 (channels 1 and 2)

The MTU output pin initialization method for each of these modes is described in this section.

10.8.2

Reset Start Operation

The MTU output pins (TIOC*) are initialized low by a reset and in standby mode. Since MTU pin

function selection is performed by the pin function controller (PFC), when the PFC is set, the

MTU pin states at that point are output to the ports. When MTU output is selected by the PFC

immediately after a reset, the MTU output initial level, low, is output directly at the port. When

the active level is low, the system will operate at this point, and therefore the PFC setting should

be made after initialization of the MTU output pins is completed.

Note:

Channel number and port notation are substituted for *.

10.8.3

Operation in Case of Re-Setting Due to Error during Operation, Etc.

If an error occurs during MTU operation, MTU output should be cut by the system. Cutoff is

performed by switching the pin output to port output with the PFC and outputting the inverse of

the active level. The pin initialization procedures for re-setting due to an error during operation,

etc., and the procedures for restarting in a different mode after re-setting, are shown below.

The MTU has four operating modes, as stated above. There are thus 16 mode transition

combinations. Possible mode transition combinations are shown in table 10.14.

SH7014 Datasheet(PDF) 307 Page - Renesas Technology Corp