3819 datasheet(84/218 Pages) RENESAS

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3819 Group USER’S MANUAL

MITSUBISHI MICROCOMPUTER

3819 Group

2.1 I/O port

2. APPLICATION

2.1 I/O Port

2.1.1 Related registers

Fig. 2.1.1 Structure of Port Pi (i = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B)

Fig. 2.1.2 Structure of Port P2 direction register

Port P2 direction register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Port P2 direction register (P2D) [Address:0516]

Port P2 direction register

0 : Port P24 input mode

1 : Port P24 output mode

0 : Port P25 input mode

1 : Port P25 output mode

0 : Port P26 input mode

1 : Port P26 output mode

0 : Port P27 input mode

1 : Port P27 output mode

Because P20 to P23 are output ports, these bits do not have a

direction register function and nothing is allocated.

Port Pi

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Port Pi0

Port Pi1

Port Pi2

Port Pi3

Port Pi4

Port Pi5

Port Pi6

Port Pi7

In output mode

Write

Read

Port latch

In input mode

Write : Port latch

Read : Value of pins

Port Pi (Pi) (i = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B)

[Address:00 16, 0216, 0416, 0616, 0816, 0A16, 0C16, 0E16, 1016, 1216, 1416, 1616]

Note :

(Note)

Port PB register [Address:16 16]

Port PB is a four-bit port (PB 0 to PB3). Accordingly, when bits 4 to 7 are

read out, the contents are “0.”

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