Datasheet

PIC18F87J72 FAMILY
DS39979A-page 168 Preliminary  2010 Microchip Technology Inc.
17.1 LCD Registers
The LCD driver module has 33 registers:
• LCD Control Register (LCDCON)
• LCD Phase Register (LCDPS)
• LCDREG Register (LCD Regulator Control)
• Five LCD Segment Enable Registers
(LCDSE4:LCDSE0)
• 20 LCD Data Registers (LCDDATAx, for x from 0 to
22, with 5, 11 and 17 not implemented)
17.1.1 LCD CONTROL REGISTERS
The LCDCON register, shown in Register 17-1,
controls the overall operation of the module. Once the
module is configured, the LCDEN (LCDCON<7>) bit is
used to enable or disable the LCD module. The LCD
panel can also operate during Sleep by clearing the
SLPEN (LCDCON<6>) bit.
The LCDPS register, shown in Register 17-2,
configures the LCD clock source prescaler and the type
of waveform: Type-A or Type-B. Details on these
features are provided in Section 17.2 “LCD Clock
Source”, Section 17.3 “LCD Bias Generation” and
Section 17.8 “LCD Waveform Generation”.
The LCDREG register is described in Section 17.3
“LCD Bias Generation”.
The LCD Segment Enable registers (LCDSEx)
configure the functions of the port pins. Setting the
segment enable bit for a particular segment configures
that pin as an LCD driver. The prototype LCDSE
register is shown in Register 17-3. There are five
LCDSE registers (LCDSE4:LCDSE0), listed in
Table 17-1.
REGISTER 17-1: LCDCON: LCD CONTROL REGISTER
R/W-0 R/W-0 R/C-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0
LCDEN SLPEN WERR — CS1 CS0 LMUX1 LMUX0
bit 7 bit 0
Legend: C = Clearable 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 LCDEN: LCD Driver Enable bit
1 = LCD driver module is enabled
0 = LCD driver module is disabled
bit 6 SLPEN: LCD Driver Enable in Sleep mode bit
1 = LCD driver module is disabled in Sleep mode
0 = LCD driver module is enabled in Sleep mode
bit 5 WERR: LCD Write Failed Error bit
1 = LCDDATAx register written while LCDPS<4> = 0 (must be cleared in software)
0 = No LCD write error
bit 4 Unimplemented: Read as ‘0’
bit 3-2 CS<1:0>: Clock Source Select bits
1x = INTRC (31 kHz)
01 = T13CKI (Timer1)
00 = System clock (F
OSC/4)
bit 1-0 LMUX<1:0>: Commons Select bits
LMUX<1:0> Multiplex Type
Maximum Number
of Pixels
Bias Type
00 Static (COM0) 33 Static
01 1/2 (COM1:COM0) 66 1/2 or 1/3
10 1/3 (COM2:COM0) 99 1/2 or 1/3
11 1/4 (COM3:COM0) 132 1/3