HD6432351 Datasheet, PDF (403/989 Pages) Renesas Technology Corp – The H8S/2000 CPU has an internal 32-bit architecture, is provided with sixteen 16-bit general registers and a concise

When a PEDDR bit is cleared to 0 (input port setting) when 8-bit bus mode is selected in mode 1,
2, 4, 5, or 6, or in mode 3 or 7, setting the corresponding PEPCR bit to 1 turns on the MOS input
pull-up for the corresponding pin.
PEPCR is initialized to H'00 by a power-on reset, and in hardware standby mode. It retains its
prior state after a manual reset, and in software standby mode.
9.12.3 Pin Functions
Modes 1, 4, and 5 [H8S/2350]; Modes 1, 2, 4, 5, and 6 [H8S/2351]: In modes 1, 2, 4, 5, and 6,
when 8-bit access is designated and 8-bit bus mode is selected, port E pins are automatically
designated as I/O ports. Setting a PEDDR bit to 1 makes the corresponding port E pin an output
port, while clearing the bit to 0 makes the pin an input port.
When 16-bit bus mode is selected, the input/output direction specification by PEDDR is ignored,
and port E is designated for data I/O.
Port E pin functions in modes 1, 2, 4, 5, and 6 are shown in figure 9-23.
Port E
8-bit bus mode
PE₇ (I/O)
PE₆ (I/O)
PE₅ (I/O)
PE₄ (I/O)
PE₃ (I/O)
PE₂ (I/O)
PE₁ (I/O)
PE₀ (I/O)
16-bit bus mode
D₇ (I/O)
D₆ (I/O)
D₅ (I/O)
D₄ (I/O)
D₃ (I/O)
D₂ (I/O)
D₁ (I/O)
D₀ (I/O)
Figure 9-23 Port E Pin Functions (Modes 1, 2, 4, 5, and 6)
Modes 3 and 7 [H8S/2351 Only]: In modes 3 and 7, port E pins function as I/O ports. Input or
output can be specified for each pin on a bit-by-bit basis. Setting a PEDDR bit to 1 makes the
corresponding port E pin an output port, while clearing the bit to 0 makes the pin an input port.
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