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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller TQFP 64 (10x10) 8-Bit 64 MHz I/O number 53
271272273274275276277278279280
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
—
(1)
LRLAT2 LRLAT1 LRLAT0
bit 7 bit 0
Legend:
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 = 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 = 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’
(1)
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 = 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 = 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’.