SH7018 datasheet(174/431 Pages) RENESAS

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8.8.2

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:

* Represents the channel number and port symbol.

8.8.3

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 three operating modes, as stated above. There are thus 9 mode transition

combinations. Possible mode transition combinations are shown in table 8.9.

Table 8.9

Mode Transition Combinations

After

Before

Normal

PWM1

PWM2

Normal

(1)

(2)

(3)

PWM1

(4)

(5)

(6)

PWM2

(7)

(8)

(9)

Legend:

Normal: Normal mode

PWM1: PWM1 mode

PWM2: PWM2 mode

The above abbreviations are used in some places in the following descriptions.

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