P21

Pull-up resistor control

Special function input data

Port input data

Special function input data

Data bus

Reset

R

D Q

Read

 

L

 

Read

 

 

 

Reset

 

 

 

 

R

 

 

 

 

D Q

 

 

Read

 

L

 

Read

 

Read

 

 

Chapter 3 Port Functions

AC zero-cross detection circuit

Schmitt trigger input

 

 

P21

Pull-up

Control bit

P2PLU1

resistor

Register

P2PLU

control

(address)

(x'03F42')

Port input

Control bit

P2IN1

Register

P2IN

 

(address)

(x'03F22')

Special

Special function

SENS

function

Control bit

P21IM

input

 

 

Register

FLOAT1

selection

(address)

(x'03F4B')

 

Figure 3-3-5 Configuration and Functions of P21

I/O Port Configuration and Functions

51

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Image 65
Panasonic MN101C00 user manual Configuration and Functions of P21