PIC16F1938_13 Datasheet, PDF (329/488 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver

PIC16(L)F1938/9
REGISTER 27-3: LCDREF: LCD REFERENCE VOLTAGE CONTROL REGISTER
R/W-0/0
LCDIRE
bit 7
R/W-0/0
LCDIRS
R/W-0/0
LCDIRI
U-0
R/W-0/0
R/W-0/0
R/W-0/0
—
VLCD3PE VLCD2PE VLCD1PE
U-0
—
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
C = Only clearable bit
bit 7
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
bit 6
LCDIRS: LCD Internal Reference Source bit
If LCDIRE = 1:
0 = Internal LCD Contrast Control is powered by VDD
1 = Internal LCD Contrast Control is powered by a 3.072V output of the FVR.
If LCDIRE = 0:
Internal LCD Contrast Control is unconnected. LCD bandgap buffer is disabled.
bit 5
LCDIRI: LCD Internal Reference Ladder Idle Enable bit
Allows the Internal FVR buffer to shut down when the LCD Reference Ladder is in power mode ‘B’
1 = When the LCD Reference Ladder is in power mode ‘B’, the LCD Internal FVR buffer is disabled.
0 = The LCD Internal FVR Buffer ignores the LCD Reference Ladder Power mode.
bit 4
Unimplemented: Read as ‘0’
bit 3
VLCD3PE: VLCD3 Pin Enable bit
1 = The VLCD3 pin is connected to the internal bias voltage LCDBIAS3⁽¹⁾
0 = The VLCD3 pin is not connected
bit 2
VLCD2PE: VLCD2 Pin Enable bit
1 = The VLCD2 pin is connected to the internal bias voltage LCDBIAS2⁽¹⁾
0 = The VLCD2 pin is not connected
bit 1
VLCD1PE: VLCD1 Pin Enable bit
1 = The VLCD1 pin is connected to the internal bias voltage LCDBIAS1⁽¹⁾
0 = The VLCD1 pin is not connected
bit 0
Unimplemented: Read as ‘0’
Note 1: Normal pin controls of TRISx and ANSELx are unaffected.
 2011-2013 Microchip Technology Inc.
DS40001574C-page 329