7477 datasheet(238/354 Pages) RENESAS

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2-3

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

APPLICATION

2.1 I/O pins

7470

7471

7477

7478

(2) Port Pi direction register (i = 0 to 5)

Switching between input and output for programmable I/O ports is performed by the port direction

setting.

Port

7470 group

00C116

00C316

00C516

–

00C916

–

Address of port direction register

Note: In the 7470 group, P2 is 4 bits of b0 - b3

and P4 is 2 bits of b0 and b1.

In the 7477 group, P4 is 2 bits of b0 and

b1.

Table 2.1.2 Port direction register memory

allocation

7471 group

00C116

00C316

00C516

–

00C916

–

7477 group

00C116

00C316

–

00C916

–

7478 group

00C116

00C316

–

00C916

–

Fig. 2.1.1 Example of port direction register setting

,,,,

When “6A16” (

) is set in the Port P0 direction register

Port P0 I/O direction

P07

P06

P05

P04

P03

P02

P01

P00

Input Output Output Input Output Input Output Input

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