H8S2245 datasheet(310/818 Pages) RENESAS

310 / 818 page

Section 8 I/O Ports

Rev.3.00 Mar. 26, 2007 Page 268 of 772

REJ09B0355-0300

Port E MOS Pull-Up Control Register (PEPCR)

PE7PCR

R/W

PE6PCR

R/W

PE5PCR

R/W

PE4PCR

R/W

PE3PCR

R/W

PE0PCR

R/W

PE2PCR

R/W

PE1PCR

R/W

Bit

Initial value

R/W

PEPCR is an 8-bit readable/writable register that controls the MOS input pull-up function

incorporated into port E on an individual bit basis.

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.

8.11.3

Pin Functions

Modes 1, 2, 4, 5, and 6

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.

Note:

Modes 2 and 6 cannot be used in the H8S/2240.

Port E pin functions in modes 1, 2, 4, 5, and 6 are shown in figure 8.22.

H8S2245 Datasheet(PDF) 310 Page - Renesas Technology Corp