38C3 datasheet(183/224 Pages) RENESAS

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3-38

APPENDIX

38C3 Group User’s Manual

3.5 Control registers

Fig. 3.5.1 Structure of Port Pi

Fig. 3.5.2 Structure of Port P0 direction register and Port P1 direction register

Port Pi

b7 b6 b5 b4 b3 b2 b1 b0

Port Pi (i = 0, 1, 2, 3, 4, 5, 6, 8)

(Pi: addresses 0016, 0216, 0416, 0616, 0816, 0A16, 0C16, 1016)

Port Pi0

qIn output mode

Write •••••••• Port latch

Read •••••••• Port latch

qIn input mode

Write •••••••• Port latch

Read •••••••• Value of pin

Port Pi1

Port Pi2

Port Pi3

Port Pi4

Port Pi5

Port Pi6

Port Pi7

Functions

Name

At reset R W

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.

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