SH7041A datasheet(450/923 Pages) RENESAS

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12.8.3

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. For large-current pins, output can also be cut by hardware, using port output

enable (POE). 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 six operating modes, as stated above. There are thus 36 mode transition

combinations, but some transitions are not available with certain channel and mode combinations.

Possible mode transition combinations are shown in table 12.18.

Table 12.18 Mode Transition Combinations

After

Before

Normal

PWM1

PWM2

PCM

CPWM

RPWM

Normal

(1)

(2)

(3)

(4)

(5)

(6)

PWM1

(7)

(8)

(9)

(10)

(11)

(12)

PWM2

(13)

(14)

(15)

(16)

None

PCM

(17)

(18)

(19)

(20)

None

CPWM

(21)

(22)

None

(23)

(24)

RPWM

(25)

(26)

None

(27)

(28)

Legend:

Normal: Normal mode

PWM1: PWM mode 1

PWM2: PWM mode 2

PCM:

Phase counting modes 1–4

CPWM: Complementary PWM mode

RPWM: Reset-synchronous PWM mode

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

12.8.4

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.

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