HD64F2145 datasheet(207/829 Pages) RENESAS

207 / 829 page

Rev. 2.0, 08/02, page 167 of 788

8.4

Port 3

Port 3 is an 8-bit I/O port. Port 3 pins also function as a bidirectional data bus, XBS bidirectional

data bus, and LPC input/output pins. Port 3 functions change according to the operating mode.

Port 3 has the following registers.

• Port 3 data direction register (P3DDR)

• Port 3 data register (P3DR)

• Port 3 pull-up MOS control register (P3PCR)

8.4.1

Port 3 Data Direction Register (P3DDR)

P3DDR specifies input or output for the pins of port 3 on a bit-by-bit basis.

Bit

Bit Name

Initial Value

R/W

Description

P37DDR

P36DDR

P35DDR

P34DDR

P33DDR

P32DDR

P31DDR

P30DDR

Modes 1, 2, and 3 (EXPE = 1)

The input/output direction specified by P3DDR is

ignored, and pins automatically function as data I/O

pins.

Modes 2 and 3 (EXPE = 0)

The corresponding port 3 pins are output ports

when P3DDR bits are set to 1, and input ports when

cleared to 0.

8.4.2

Port 3 Data Register (P3DR)

P3DR stores output data of port 3.

Bit

Bit Name

Initial Value

R/W

Description

P37DR

R/W

P36DR

R/W

P35DR

R/W

P34DR

R/W

P33DR

R/W

P32DR

R/W

P31DR

R/W

P30DR

R/W

If a port 3 read is performed while P3DDR bits are

set to 1, the P3DR values are read directly,

regardless of the actual pin states. If a port 3 read is

performed while P3DDR bits are cleared to 0, the

pin states are read.

HD64F2145 Datasheet(PDF) 207 Page - Renesas Technology Corp

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