SH7040 Datasheet, PDF (450/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

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
Before
Normal
PWM1
PWM2
Normal
(1)
(2)
(3)
PWM1
(7)
(8)
(9)
PWM2
(13)
(14)
(15)
PCM
(17)
(18)
(19)
CPWM
(21)
(22)
None
RPWM
(25)
(26)
None
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
After
PCM
(4)
(10)
(16)
(20)
None
None
CPWM
(5)
(11)
None
None
(23)
(27)
RPWM
(6)
(12)
None
None
(24)
(28)
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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