HD6473258CP10 Datasheet, PDF (99/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Reset: P4DDR and P4DR and the 8-bit timer control registers are initialized, making pins P40 to
P45 into input port pins with the MOS pull-ups off. When the chip comes out of reset into single-
chip mode (mode 3), P46 and P47 also become input port pins with the MOS pull-ups off. When the
chip comes out of reset into an expanded mode (mode 1 or 2), the system clock and E clock are
output at P46 and P47.
Hardware Standby Mode: All pins are placed in the high-impedance state with the MOS pull-ups
off.
Software Standby Mode: The 8-bit timer control registers are initialized but P4DDR and P4DR
remain in their previous states. Pins P40 to P45 become input or output port pins depending on the
setting of P4DDR. Pins P46 and P47 remain in their previous states, with system clock output
remaining high and E clock output remaining low. The MOS pull-ups of input pins are on or off
depending on the values in P4DR.
Figures 5-4 to 5-7 show schematic diagrams of port 4.
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