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7480 Group and 7481 Group User's Manual

1-32

HARDWARE

1.10 Input/Output Pins

(2)

Port Pi Direction Registers (i = 0, 1, 4, 5)

These registers switch the input and output of the programmable I/O port pins P00–P07, P10–P17,

P40–P43, and P50–P53.

Note: The 7480 Group does not have port P5 and, consequently, is not provided with the port P5

direction register.

Figure 1.10.6 shows the port Pi direction registers (i = 0, 1, 4, 5).

Figure 1.10.6 Port Pi Direction Registers (i = 0, 1, 4, 5)

Port Pi direction register (i=0,1,4,5)

b4 b3 b2 b1 b0

Name

Function

At reset

Port Pi direction register (PiD, i=0,1,4,5) [Addresses 00C116,00C316,00C916,00CB16]

Port Pi direction register (Note)

0 : Input mode

1 : Output mode

Note: • In the 7480 Group, port P4 direction register has only bits 0 and 1. In the 7481 Group, port P4 direction register

has only bits 0 to 3. The other bits are not implemented (bits 4 to 7: ‘0’ at reading, bits 2 and 3 in the 7480 Group:

undefined).

• The 7480 Group does not have port P5 direction register. In the 7481 Group, port P5 has only bits 0 to 3.

The other bits are not implemented (‘0’ at reading).

0 : Input mode

1 : Output mode

0 : Input mode

1 : Output mode

0 : Input mode

1 : Output mode

0 : Input mode

1 : Output mode

0 : Input mode

1 : Output mode

0 : Input mode

1 : Output mode

0 : Input mode

1 : Output mode

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