Chapter 4 I/O Ports

4-8-3 Block Diagram

Pull-up resistor control

I/O direction control

Port output data

Function switching output buffer

Port input data

 

Reset

 

 

R

P8PLU0-7

 

D Q

 

Write

L

Read

 

Reset

 

 

R

P8DIR0-7

 

D Q

 

Write

L

Read

 

Reset

P80-P87

Data

 

R

P8OUT0-7

bus

D Q

 

 

 

Write

L

Read

 

Reset

 

 

R

P8LED0-7

 

D Q

 

Write

L

Read

 

 

P8IN0-7

 

Read

 

Figure 4-8-3 Block Diagram (P80 to P87)

IV - 40 Port 8

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Image 190
Panasonic MN101C77C, F77G user manual Block Diagram P80 to P87