7477 datasheet(54/354 Pages) RENESAS

54 / 354 page

7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.10 I/O pins

1-37

At reset

Port Pi direction register (PiD) (i = 0,1,2,4)

[Address 00C116, 00C316, 00C516, 00C916]

Port Pi direction register

Port Pi direction

0 : Port Pi0 input mode

1 : Port Pi0 output mode

0 : Port Pi1 input mode

1 : Port Pi1 output mode

0 : Port Pi2 input mode

1 : Port Pi2 output mode

0 : Port Pi3 input mode

1 : Port Pi3 output mode

0 : Port Pi4 input mode

1 : Port Pi4 output mode

0 : Port Pi5 input mode

1 : Port Pi5 output mode

0 : Port Pi6 input mode

1 : Port Pi6 output mode

0 : Port Pi7 input mode

1 : Port Pi7 output mode

Name

Function

Notes 1:

The 7477/7478 group is not provided with the port P2

direction register (input only).

The Port P4 is provided as below:

•7470/7477 group has 2 bits of P4 0 and P41.

•7471/7478 group has 4 bits of P4 0 to P43.

(2) Input/output selection of the programmable I/O ports

An input/output selection of the programmable I/O ports is made by the Port direction register

corresponding to each port.

Figure 1.10.2 shows a structure of Port Pi (i = 0, 1, 2, 4) direction register.

Note: Each direction register is initialized into “0016” at reset, so that the I/O ports are put into an

input state.

Fig. 1.10.2 Structure of Port Pi direction register (i=0, 1, 2, 4)

7477 Datasheet(PDF) 54 Page - Renesas Technology Corp