HD64F2149YV datasheet(241/1075 Pages) RENESAS

241 / 1075 page

Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 213 of 1044

REJ09B0280-0300

8.3.3

Pin Functions in Each Mode

Mode 1: In mode 1, port 2 pins automatically function as address outputs. The port 2 pin functions

are shown in figure 8.6.

A15 (Output)

A14 (Output)

A13 (Output)

A12 (Output)

A11 (Output)

A10 (Output)

A9 (Output)

A8 (Output)

Port 2

Figure 8.6 Port 2 Pin Functions (Mode 1)

Modes 2 and 3 (EXPE = 1): In modes 2 and 3 (when EXPE = 1), port 2 pins function as address

outputs, PWM outputs, or I/O ports, and input or output can be specified on a bit-by-bit basis.

When a bit in P2DDR is set to 1, the corresponding pin functions as an address output or PWM

output, and when cleared to 0, as an input port. 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 supporting 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 supporting module output pin when port 2 pins are used as address output

pins.

The port 2 pin functions are shown in figure 8.7.

A15 (Output)/P27 (Output)

A14 (Output)/P26 (Output)

A13 (Output)/P25 (Output)

A12 (Output)/P24 (Output)

A11 (Output)

A10 (Output)

A9 (Output)

A8 (Output)

Port 2

When P2DDR = 1

and PWOERB = 0

P27 (Input)/CBLANK (Output)

P26 (Input)

P25 (Input)

P24 (Input)

P23 (Input)

P22 (Input)

P21 (Input)

P20 (Input)

When P2DDR = 0

PW15 (Output)/CBLANK (Output)

PW14 (Output)

PW13 (Output)

PW12 (Output)

PW11 (Output)

PW10 (Output)

PW9 (Output)

PW8 (Output)

When P2DDR = 1

and PWOERB = 1

Figure 8.7 Port 2 Pin Functions (Modes 2 and 3 (EXPE = 1))

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