PIC18F87K90T-I/PT Microchip Technology, PIC18F87K90T-I/PT Datasheet - Page 276

• Manufacturer Part Number: PIC18F87K90T-I/PT
• Description: 128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm T/
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F87K90T-I/PT

• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 4 KB
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 64 MHz
• Number Of Timers: 11
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 24 Channel
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP
• Lead Free Status / Rohs Status: Details

PIC18F87K90 FAMILY
REGISTER 20-3:
DS39957D-page 276
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5-3
bit 2
bit 1
bit 0
LCDIRE
R/W-0
LCDIRE: LCD Internal Reference Enable bit
1 = Internal LCD reference is enabled and connected to the internal contrast control circuit
0 = Internal LCD reference is disabled
LCDIRS: LCD Internal Reference Source bit
If LCDIRE = 1:
1 = Internal LCD contrast control is powered by V
0 = Internal LCD contrast control is powered by V
If LCDIRE = 0:
Internal LCD contrast control is unconnected. LCD band gap buffer is disabled.
LCDCST<2:0>: LCD Contrast Control bits
Selects the Resistance of the LCD Contrast Control Resistor Ladder:
111 = Resistor ladder is at maximum resistance (minimum contrast)
110 = Resistor ladder is at 6/7th of maximum resistance
101 = Resistor ladder is at 5/7th of maximum resistance
100 = Resistor ladder is at 4/7th of maximum resistance
011 = Resistor ladder is at 3/7th of maximum resistance
010 = Resistor ladder is at 2/7th of maximum resistance
001 = Resistor ladder is at 1/7th of maximum resistance
000 = Minimum resistance (maximum contrast); resistor ladder is shorted
VLCD3PE: Bias 3 Pin Enable bit
1 = Bias 3 level is connected to the external pin, LCDBIAS3
0 = Bias 3 level is internal (internal resistor ladder)
VLCD2PE: Bias 2 Pin Enable bit
1 = Bias 2 level is connected to the external pin, LCDBIAS2
0 = Bias 2 level is internal (internal resistor ladder)
VLCD1PE: Bias 1 Pin Enable bit
1 = Bias 1 level is connected to the external pin, LCDBIAS1
0 = Bias 1 level is internal (internal resistor ladder)
LCDIRS
R/W-0
LCDREF: LCD REFERENCE VOLTAGE CONTROL REGISTER
W = Writable bit
‘1’ = Bit is set
LCDCST2
R/W-0
LCDCST1
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
LCDCST0
R/W-0
DDCORE
DD
(3.3V) voltage
VLCD3PE
R/W-0
 2009-2011 Microchip Technology Inc.
x = Bit is unknown
VLCD2PE
R/W-0
VLCD1PE
R/W-0
bit 0