H8SSLASH2214 datasheet(406/936 Pages) RENESAS

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Section 9 I/O Ports

Rev.4.00 Sep. 18, 2008 Page 346 of 872

REJ09B0189-0400

(2) Mode 7

In mode 7, port E functions as an I/O port, and input or output can be specified bit by bit. 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 9.17.

PE7 (input/output)

PE6 (input/output)

PE5 (input/output)

PE4 (input/output)

PE3 (input/output)

PE2 (input/output)

PE1 (input/output)

PE0 (input/output)

Port E

Figure 9.17 Port E Pin Functions (Mode 7)

9.11.4

MOS Input Pull-Up Function

Port E has an on-chip MOS input pull-up function that can be controlled by software. MOS input

pull-up can be used in modes 4 to 6 in 8-bit bus mode, or in mode 7, and can be specified as on or

off for individual bits.

With the port input pin function (modes 4 to 6 in 8-bit bus mode, or mode 7), when a PEDDR bit

is cleared to 0, 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 previous state is retained after a manual reset and in software standby mode.

Table 9.21 summarizes the MOS input pull-up states.

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