Hitachi H8S/2633 Hardware Manual page 415

Mode 7: In mode 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.

Port E pin functions in mode 7 are shown in figure 10-21.

10.11.4 MOS Input Pull-Up Function

Port E has a built-in MOS input pull-up function that can be controlled by software. This MOS

input pull-up function can be used in modes 4 to 6 when 8-bit bus mode is selected, or in mode 7,

and can be specified as on or off on an individual bit basis.

When a PEDDR bit is cleared to 0 in mode 4 to 6 when 8-bit bus mode is selected, or in mode 7,

setting the corresponding PEPCR bit to 1 turns on the MOS input pull-up for that pin.

The MOS input pull-up function is in the off state after a power-on reset, and in hardware standby

mode. The prior state is retained by a manual reset or in software standby mode.

Table 10-19 summarizes the MOS input pull-up states.

Table 10-19 MOS Input Pull-Up States (Port E)

: MOS input pull-up is always off.

ON/OFF : On when PEDDR = 0 and PEPCR = 1; otherwise off.

Figure 10-21 Port E Pin Functions (Mode 7)

Standby Mode

Standby Mode