Hitachi H8/329 Series Hardware Manual page 99

In mode 3 (single-chip mode), these pins can be used for general-purpose input or output.
Pin P4 : In modes 1 and 2, this pin is used for system clock (Ø) output.
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In mode 3, this pin is used for general-purpose input if P4
output if P4 DDR is set to "1."
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Pin P4 : In modes 1 and 2, this pin is used for input of the WAIT bus control signal. It is
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unaffected by the values in P4DDR and P4DR.
In mode 3 (single-chip mode), this pin can be used for general-purpose input or output.
Reset: In the single-chip mode (mode 3), a reset initializes all pins of port 4 to the general-purpose
input function. In the expanded modes (modes 1 and 2), P4
pins, and P4 to P4 are initialized to their bus control and system clock output functions.
3 7
Hardware Standby Mode: All pins are placed in the high-impedance state.
DDR is cleared to "0," or system clock
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to P4 are initialized as input port
0 2
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