H8S-2214 Datasheet, PDF (405/936 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2100 Series

Section 9 I/O Ports
PEPCR is an 8-bit readable/writable register that controls the MOS input pull-up function
incorporated into port E on a bit-by-bit basis.
PEPCR is valid for port input pins (modes 4 to 6 in 8-bit bus mode, or mode 7).
When a PEDDR bit is cleared to 0 (input port setting), 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
previous state after a manual reset and in software standby mode.
9.11.3 Pin Functions in Each Mode
(1) Modes 4 to 6
In modes 4 to 6, if 8-bit access space is designated and 8-bit bus mode is selected, port E functions
as an I/O port. 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 settings in PEDDR are ignored, and
port E pins function as data input/output pins.
Port E pin functions in modes 4 to 6 are shown in figure 9.16.
Port E
8-bit bus mode
PE7 (input/output)
PE6 (input/output)
PE5 (input/output)
PE4 (input/output)
PE3 (input/output)
PE2 (input/output)
PE1 (input/output)
PE0 (input/output)
16-bit bus mode
D7 (input/output)
D6 (input/output)
D5 (input/output)
D4 (input/output)
D3 (input/output)
D2 (input/output)
D1 (input/output)
D0 (input/output)
Figure 9.16 Port E Pin Functions (Modes 4 to 6)
Rev.4.00 Sep. 18, 2008 Page 345 of 872
REJ09B0189-0400