HD6473258CP10 Datasheet, PDF (89/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Mode 2: In mode 2 (expanded mode with on-chip ROM), the usage of port 1 can be selected on a
pin-by-pin basis. A pin is used for general-purpose input if its data direction bit is cleared to 0, or
for address output if its data direction bit is set to 1.
Mode 3: In the single-chip mode port 1 is a general-purpose input/output port.
Reset: A reset clears P1DDR and P1DR to all 0, placing all pins in the input state with the MOS
pull-ups off. In mode 1, when the chip comes out of reset P1DDR is set to all 1, making all pins
address output pins.
Hardware Standby Mode: All pins are placed in the high-impedance state with the MOS pull-ups
off.
Software Standby Mode: P1DDR and P1DR remain in their previous state. Address output pins
are low. General-purpose output pins continue to output the data in P1DR. The MOS pull-ups of
input pins are on or off depending on the values in P1DR.
Figure 5-1 shows a schematic diagram of port 1.
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