NEC PD789488, PD789489, PD78F9488, PD78F9489

CHAPTER 2 PIN FUNCTIONS

User’s Manual U15331EJ4V1UD 39

(2) Non-port pins (2/2)

Pin Name I/O Function After Reset Alternate Function

S0 to S15 LCD controller/driver segment signal outputs Low-level

output

–

S16 to S19Note 1 Only when segment output is selected by

mask option

–

S20 to S27Note 2

Output

Only when segment output is selected by

mask option

–

COM0 to COM3 Output LCD controller/driver common signal outputs Low-level

output

–

VLC0 to VLC2 – LCD drive voltage – –

CAPH, CAPL − LCD drive voltage booster capacitor connection pin – –

ANI0 to ANI7 – A/D converter analog input – P60 to P67Note 3

P60/KR10 to

P67/KR17Note 4

AVSS – A/D converter ground potential – –

AVDD – A/D converter analog power supply – –

X1 Input – –

X2 –

Connecting crystal resonator for main system clock oscillation

– –

XT1 Input – –

XT2 –

Connecting crystal resonator for subsystem clock oscillation

– –

RESET Input System reset input Input –

VDD – Positive power supply – –

VSS – Ground potential – –

IC0 – Internally connected. Connect directly to VSS. – –

VPP – Sets flash memory programming mode. Used to apply high

voltage when a program is written or verified.

– –

Notes 1. Whether to use these pins as input ports pins (P70 to P73) or segment outputs (S16 to S19) can be

selected in 1-bit units by means of a mask option in the

PD789488, 789489 or a port mode register in

the

PD78F9488, 78F9489 (refer to 4.3(3) Port function registers and CHAPTER 20 MASK

OPTIONS).

2. Whether to use these pins as I/O port pins (P80 to P87) or segment outputs (S20 to S27) can be

selected in 1-bit units by means of a mask option in the

PD789488, 789489 or a port mode register in

the

PD78F9488, 78F9489 (refer to 4.3(3) Port function registers and CHAPTER 20 MASK

OPTIONS).

PD789488 and 78F9488 only

PD789489 and 78F9489 only