PD17012_15 Datasheet, PDF (89/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
10.4.2 Using input ports (P0D and P1D)
The input data is read by executing an instruction, such as SKT, that reads the contents of the port register
corresponding to each port pin.
When a high level is input to each pin, 1 is read to the corresponding port register; when a low level is input,
0 is read.
Nothing is changed even if a write instruction, such as MOV, is executed to the port register.
10.4.3 Notes on using input port (P0D)
The P0D is internally pulled down when it is used as a general-purpose port.
10.4.4 Status of input ports (P0D and P1B) on reset
(1) On power-on reset
All the input ports are specified as general-purpose input ports.
(2) On CE reset
All the input ports are specified as general-purpose input ports.
(3) On execution of clock stop instruction
All the input ports are specified as general-purpose input ports.
Because the RESET signal is output when the clock stop instruction is executed, P1B prevents an increase
in the current dissipation due to the noise of the input buffer as described in 10.4.1.
P0D is internally pulled down.
(4) In halt status
The previous status is retained.
Data Sheet U10101EJ4V0DS
87