Microchip Technology ARD00385 Data Sheet
2009-2011 Microchip Technology Inc.
DS39957D-page 277
PIC18F87K90 FAMILY
REGISTER 20-4:
LCDRL: LCD REFERENCE LADDER CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
LRLAP1
LRLAP0
LRLBP1
LRLBP0
—
LRLAT2
LRLAT1
LRLAT0
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
LRLAP<1:0>:
LCD Reference Ladder A Time Power Control bits
During Time Interval A:
11
11
= Internal LCD reference ladder is powered in High-Power mode
10
= Internal LCD reference ladder is powered in Medium Power mode
01
= Internal LCD reference ladder is powered in Low-Power mode
00
= Internal LCD reference ladder is powered down and unconnected
bit 5-4
LRLBP<1:0>:
LCD Reference Ladder B Time Power Control bits
During Time Interval B:
11
11
= Internal LCD reference ladder is powered in High-Power mode
10
= Internal LCD reference ladder is powered in Medium Power mode
01
= Internal LCD reference ladder is powered in Low-Power mode
00
= Internal LCD reference ladder is powered down and unconnected
bit 3
Unimplemented:
Read as ‘0’
(
bit 2-0
LRLAT<2:0>:
LCD Reference Ladder A Time Interval Control bits
Sets the number of 32 clock counts when the A Time Interval Power mode is active.
For Type-A Waveforms (WFT = 0):
000
For Type-A Waveforms (WFT = 0):
000
= Internal LCD reference ladder is always in B Power mode
001
= Internal LCD reference ladder is in A Power mode for 1 clock and B Power mode for 15 clocks
010
= Internal LCD reference ladder is in A Power mode for 2 clocks and B Power mode for 14 clocks
011
= Internal LCD reference ladder is in A Power mode for 3 clocks and B Power mode for 13 clocks
100
= Internal LCD reference ladder is in A Power mode for 4 clocks and B Power mode for 12 clocks
101
= Internal LCD reference ladder is in A Power mode for 5 clocks and B Power mode for 11 clocks
110
= Internal LCD reference ladder is in A Power mode for 6 clocks and B Power mode for 10 clocks
111
= Internal LCD reference ladder is in A Power mode for 7 clocks and B Power mode for 9 clocks
For Type-B Waveforms (WFT = 1):
000
000
= Internal LCD reference ladder is always in B Power mode
001
= Internal LCD reference ladder is in A Power mode for 1 clock and B Power mode for 31 clocks
010
= Internal LCD reference ladder is in A Power mode for 2 clocks and B Power mode for 30 clocks
011
= Internal LCD reference ladder is in A Power mode for 3 clocks and B Power mode for 29 clocks
100
= Internal LCD reference ladder is in A Power mode for 4 clocks and B Power mode for 28 clocks
101
= Internal LCD reference ladder is in A Power mode for 5 clocks and B Power mode for 27 clocks
110
= Internal LCD reference ladder is in A Power mode for 6 clocks and B Power mode for 26 clocks
111
= Internal LCD reference ladder is in A Power mode for 7 clocks and B Power mode for 25 clocks
Note 1:
LCDRL<3> should be maintained as ‘0’.