H8SSLASH2214 datasheet(405/936 Pages) RENESAS

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Section 9 I/O Ports

Rev.4.00 Sep. 18, 2008 Page 345 of 872

REJ09B0189-0400

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.

PE7 (input/output)

PE6 (input/output)

PE5 (input/output)

PE4 (input/output)

PE3 (input/output)

PE2 (input/output)

PE1 (input/output)

PE0 (input/output)

D7 (input/output)

D6 (input/output)

D5 (input/output)

D4 (input/output)

D3 (input/output)

D2 (input/output)

D1 (input/output)

D0 (input/output)

8-bit bus mode

Port E

16-bit bus mode

Figure 9.16 Port E Pin Functions (Modes 4 to 6)

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