HD404669 Datasheet, PDF(20/142 Page) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

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HD404669 Datasheet, PDF (20/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

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HD404669 Series

Reset

The MCU can be reset by setting the RESET pin high or by setting the STOPC pin low*. When power is

first applied, or when clearing subactive mode, watch mode, or stop mode, the RESET input must be held

for at least tRC to assure that the oscillation stabilization time (tRC) condition is fulfilled.

Similarly, the STOPC pin input must held for at least tRC when clearing stop mode with a STOPC pin input

to assure that the oscillator stabilizes.

In all other cases, the MCU is reset by a RESET input that is held for at least two instruction execution

cycles.

Table 1 lists the section of the MCU that are initialized by a reset and the initial values.

Note: * The STOPC pin reset is only effective in stop mode.

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