Microchip Technology MA180027 User Manual
PICDEM™ LCD 2 Demonstration Kit User’s Guide
DS51662C-page 46
2010 Microchip Technology Inc.
TABLE A-21:
PIC16F917 PIN AND PORT COMPARISON
A.3
LED DISPLAY
Two green LEDs are connected to RC3 and RC4 of U1A through the J14 pins, 1, 2 and
7, 8 (outer ends), respectively.
7, 8 (outer ends), respectively.
One green LED is provided to determine whether there is power to the LCD 2
Demonstration Board (LED on) or not (LED off).
Demonstration Board (LED on) or not (LED off).
A.4
CHARGE PUMP AND VLCAP
For charge pump mode operation in PIC18F85J90 and PIC18F87J90 devices, it is
required that RC3 and RC4 of U1A connect to charge pump capacitor C7 through the
J14 pins, 3, 4 and 5, 6 (inner pins), respectively.
required that RC3 and RC4 of U1A connect to charge pump capacitor C7 through the
J14 pins, 3, 4 and 5, 6 (inner pins), respectively.
A.5
RESISTIVE LADDER VERSUS CHARGE PUMP
The switch, S6, allows the connection of either the resistor ladder or the capacitors to
the BIAS pins to generate the BIAS voltages for the LCD operation. For the Charge
Pump mode operation in PIC18F85J90 and PIC18F87J90 devices, it is required that
the S6 switch is flipped towards C and the VLCAP is connected through the inner
jumpers of J14. For the resistor ladder, S6 must be flipped towards R. The R45
potentiometer controls the contrast to the LCD in the Resistive Ladder mode.
the BIAS pins to generate the BIAS voltages for the LCD operation. For the Charge
Pump mode operation in PIC18F85J90 and PIC18F87J90 devices, it is required that
the S6 switch is flipped towards C and the VLCAP is connected through the inner
jumpers of J14. For the resistor ladder, S6 must be flipped towards R. The R45
potentiometer controls the contrast to the LCD in the Resistive Ladder mode.
A.5.1
Jumper JP21
When jumper JP21 is on, the LCDBIAS0 is physically tied to ground. The jumper needs
to be on for PIC18F85J90 and PIC18F87J90 devices when the bias voltages are
generated through the resistor ladder.
to be on for PIC18F85J90 and PIC18F87J90 devices when the bias voltages are
generated through the resistor ladder.
PIC16F917 Port
PIC16F917 Pin
ICE Pin
ICE Port
RA0
AN0
AN0
RA0
RA1
AN1
AN1
RA1
RA6
T1OSCO
T1OSCO
RC0
RA7
T1OSCI
T1OSCI
RC1
RB0
RB0
RB0
RB0
RB5
COM1
COM1
RE4
RB6
RB6
RB6
RB6
RB7
RB7
RB7
RB7
RC0
VLCD1
BIAS1
RE0
RC1
VLCD2
BIAS2
RE1
RC3
SEG6
SEG11
RB4
RC4
SEG11
SEG14
RA4
RC6
TX/CK
TX/CK
RC6
RC7
RX/DT
RX/DT
RC7
Legend:
Unshaded cells indicate a perfect match between the PIM and the glass.
Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.
Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.
Note 1:
For the PIC18F85J90 and PIC18F87J90 PIM, the RG2 and RG3 pins are
connected to RC3 and RC4 of U1A, respectively.
connected to RC3 and RC4 of U1A, respectively.
2:
For the PIC16F17 PIM, the RD1 and RD2 pins are connected to RC3 and
RC4 of U1A, respectively.
RC4 of U1A, respectively.
3:
For the PIC18F8490 PIM, the RC3 and RD4 pins are connected to RC3
and RC4 of U1A, respectively
and RC4 of U1A, respectively