NEC PD78F9488 Manuale Utente

CHAPTER  2   PIN  FUNCTIONS 

 

User’s Manual  U15331EJ4V1UD

This is an 8-bit input-only port. In addition to a general-purpose input port function, it has A/D converter input and 

key return signal detection

 functions.  

 
(1) Port 

In this mode, P60 to P67 function as an 8-bit input-only port.  

 
(2) Control 

In this mode, P60 to P67 function as the analog inputs of the A/D converter and key return signal detection 
pins

.  

 
(a)  ANI0 to ANI7 

These are the analog input pins of the A/D converter. 
 

These are the key return signal detection pins. 
 
Note 

µ

PD789489 and 78F9489 only 

 

These pins constitute a 4-bit input-only port.  This port can be used only when the port function is selected by a 

mask option in the 

µ

PD789488, 789489 or by a port function register in the 

µ

PD78F9488, 78F9489. 

 

These pins constitute an 8-bit I/O port. Port 8 can be set in the input or output mode in 1-bit units by port mode 

register 8 (PM8).  This port can be used only when the port function is selected by a mask option in the 

µ

PD789488, 

789489 or by a port function register in the 

µ

PD78F9488, 78F9489. 

 

These pins are the segment signal output pins for the LCD controller/driver. 
 
Note  Pins S16 through S27 can be used only when segment output is selected by a mask option in the 

µ

PD789488, 789489 or by a port function register in the 

µ

PD78F9488, 78F9489. 

 
2.2.10  COM0 to COM3 

These pins are the common signal output pins for the LCD controller/driver. 
 

These pins are the power supply voltage pins for driving the LCD. 
 

These pins are the capacitor connection pins for driving the LCD.