NEC PD789488, PD789489, PD78F9488, PD78F9489

CHAPTER 2 PIN FUNCTIONS

User’s Manual U15331EJ4V1UD

2.2.6 P60 to P67 (Port 6)

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 detectionNote functions.

(1) Port mode

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

(2) Control mode

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

pinsNote.

(a) ANI0 to ANI7

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

(b) KR10 to KR17Note

These are the key return signal detection pins.

Note

PD789489 and 78F9489 only

2.2.7 P70 to P73 (Port 7)

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

PD789488, 789489 or by a port function register in the

PD78F9488, 78F9489.

2.2.8 P80 to P87 (Port 8)

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

PD789488,

789489 or by a port function register in the

PD78F9488, 78F9489.

2.2.9 S0 to S27Note

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

PD789488, 789489 or by a port function register in the

PD78F9488, 78F9489.

2.2.10 COM0 to COM3

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

2.2.11 VLC0 to VLC2

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

2.2.12 CAPH, CAPL

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