38C3 datasheet(69/224 Pages) RENESAS

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2-4

38C3 Group User’s Manual

APPLICATION

2.1 I/O port

Fig. 2.1.5 Structure of Port Pi direction register (i = 2, 4, 5, 6, 8)

Fig. 2.1.4 Structure of Port P0 direction register and port P1 direction register

Port P0 direction register, Port P1 direction register

b7 b6 b5 b4 b3 b2 b1 b0

Port P0 direction register (P0D: address 0116)

Port P1 direction register (P1D: address 0316)

Name

Functions

At reset R W

Ports P0/P1

direction register

Nothing is arranged for these bits. When these

bits are read out, the contents are undefined.

0 : All bits of ports P0/P1

input mode

1 : All bits of ports P0/P1

output mode

Note: Ports P0 and P1 are switched to input and output by each port.

When b0 of corresponding port direction register is set to “0”, all

8 bits of port become input port. When b0 of corresponding port

direction register is set to “1”, all 8 bits of port become output

port. Nothing is arranged for b1 to b7 of port P0 and port P1

direction registers. These are write disabled bits.

Port Pi direction register

b7 b6 b5 b4 b3 b2 b1 b0

Port Pi direction register (i = 2, 4, 5, 6, 8)

(PiD: addresses 0516, 0916, 0B16, 0D16, 1116)

0 : Port Pi0 input mode

1 : Port Pi0 output mode

Name

Functions

At reset R W

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

Port Pi direction

Note: Bit 1 of the port P5 direction register (address 0B16) does not have

direction register function, because P51 is an input port. When writing to

bit 1 of the port P5 direction register, write “0” to the bit.

0 : Port Pi1 input mode

1 : Port Pi1 output mode

(Note)

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