HD64F2149YV datasheet(236/1075 Pages) RENESAS

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Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 208 of 1044

REJ09B0280-0300

Modes 2 and 3 (EXPE = 0): In modes 2 and 3 (when EXPE = 0), port 1 pins function as PWM

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

P1DDR is set to 1, the corresponding pin functions as a PWM output or output port, and when

cleared to 0, as an input port.

The port 1 pin functions are shown in figure 8.4.

P17 (I/O)

P16 (I/O)

P15 (I/O)

P14 (I/O)

P13 (I/O)

P12 (I/O)

P11 (I/O)

P10 (I/O)

Port 1

P1n: Input pin when P1DDR = 0,

output pin when P1DDR = 1

and PWOERA = 0

PW7 (Output)

PW6 (Output)

PW5 (Output)

PW4 (Output)

PW3 (Output)

PW2 (Output)

PW1 (Output)

PW0 (Output)

When P1DDR = 1

and PWOERA = 1

Figure 8.4 Port 1 Pin Functions (Modes 2 and 3 (EXPE = 0))

8.2.4

MOS Input Pull-Up Function

Port 1 has a built-in MOS input pull-up function that can be controlled by software. This MOS

input pull-up function can be used in modes 2 and 3, and can be specified as on or off on a bit-by-

bit basis.

When a P1DDR bit is cleared to 0 in mode 2 or 3, setting the corresponding P1PCR 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 reset and in hardware standby mode. The

prior state is retained in software standby mode.

Table 8.3 summarizes the MOS input pull-up states.

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