HD64F2145 datasheet(203/829 Pages) RENESAS

203 / 829 page

Rev. 2.0, 08/02, page 163 of 788

8.3

Port 2

Port 2 is an 8-bit I/O port. Port 2 pins also function as address bus output function, 8-bit PWM

output pins, and the timer connection output pin. Port 2 functions change according to the

operating mode. Port 2 has an on-chip input pull-up MOS function that can be controlled by

software. Port 2 has the following registers.

• Port 2 data direction register (P2DDR)

• Port 2 data register (P2DR)

• Port 2 pull-up MOS control register (P2PCR)

8.3.1

Port 2 Data Direction Register (P2DDR)

P2DDR specifies input or output for the pins of port 2 on a bit-by-bit basis.

Bit

Bit Name

Initial Value

R/W

Description

P27DDR

P26DDR

P25DDR

P24DDR

P23DDR

P22DDR

P21DDR

P20DDR

In Mode 1:

The corresponding port 2 pins are address outputs,

regardless of the P2DDR setting.

Modes 2 and 3 (EXPE = 1):

The corresponding port 2 pins are address outputs

or PWM outputs when P2DDR bits are set to 1,

and input ports when cleared to 0. P27 to P24 are

switched from address outputs to output ports by

setting the IOSE bit to 1.

P27 can be used as an on-chip peripheral module

output pin regardless of the P27DDR setting, but to

ensure normal access to external space, P27

should not be set as an on-chip peripheral module

output pin when port 2 pins are used as address

output pins.

Modes 2 and 3 (EXPE = 0):

The corresponding port 2 pins are output ports or

PWM outputs when P2DDR bits are set to 1, and

input ports when cleared to 0.

P27 can be used as an on-chip peripheral module

output pin regardless of the P27DDR setting.

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