PD17012_15 Datasheet, PDF (180/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
15.9 Status of Serial Interface on Reset
15.9.1 On power-on reset
Each pin is set in the general-purpose input port mode (floating output).
The value of the presettable shift register is undefined.
15.9.2 On execution of clock stop instruction
Each pin is set in the general-purpose input port mode (floating output).
The presettable shift register retains the previous value.
15.9.3 On CE reset
Each pin is set in the general-purpose input port mode (floating output).
The presettable shift register retains the previous value.
15.9.4 In halt status
Each pin retains the current status.
If the internal clock is used (master operation) at this time, the clock is not output after the HALT instruction
has been executed.
To use the internal clock, therefore, the HALT instruction must be executed after communication has been
completed.
If an external clock is forcibly input, the serial interface functions even when the internal clock is used.
If the external clock is used (slave operation), the operation continues even when the HALT instruction has
been executed.
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Data Sheet U10101EJ4V0DS