Microchip Technology DM160214 Data Sheet

 2010-2012 Microchip Technology Inc.

DS41414D-page 339

PIC16(L)F1946/47

REGISTER 27-3:

LCDREF: LCD REFERENCE VOLTAGE CONTROL REGISTER

R/W-0/0

U-0

R/W-0/0

U-0

LCDIRE

LCDIRS

LCDIRI

—

VLCD3PE

VLCD2PE

VLCD1PE

—

bit 7

bit 0

Legend:
R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = Bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

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 V

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.