Microchip Technology MA240029 データシート
PIC24FJ128GA310 FAMILY
DS39996F-page 268
2010-2011 Microchip Technology Inc.
REGISTER 21-2:
LCDREG: LCD CHARGE PUMP CONTROL REGISTER
RW-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
CPEN
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
RW-1
RW-1
RW-1
RW-1
RW-0
RW-0
—
—
BIAS2
BIAS1
BIAS0
MODE13
CKSEL1
CKSEL0
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 15
CPEN:
3.6V Charge Pump Enable bit
(
1
= The regulator generates the highest (3.6V) voltage
0
= Highest voltage in the system is supplied externally (AV
DD
)
bit 14-6
Unimplemented:
Read as ‘0’
bit 5-3
BIAS<2:0>:
Regulator Voltage Output Control bits
111
= 3.60V peak (offset on LCDBIAS0 of 0V)
110
= 3.47V peak (offset on LCDBIAS0 of 0.13V)
101
= 3.34V peak (offset on LCDBIAS0 of 0.26V)
100
= 3.21V peak (offset on LCDBIAS0 of 0.39V)
011
= 3.08V peak (offset on LCDBIAS0 of 0.52V)
010
= 2.95V peak (offset on LCDBIAS0 of 0.65V)
001
= 2.82V peak (offset on LCDBIAS0 of 0.78V)
000
= 2.69V peak (offset on LCDBIAS0 of 0.91V)
bit 2
MODE13:
1/3 LCD Bias Enable bit
1
= Regulator output supports 1/3 LCD Bias mode
0
= Regulator output supports Static LCD Bias mode
bit 1-0
CLKSEL<1:0>
: Regulator Clock Select Control bits
11
= LPRC 31 kHz
10
= 8 MHz FRC
01
= SOSC
00
= Disable regulator and float regulator voltage output
Note 1:
When using the charge pump, the LCDBIASx pins and the V
LCAP
1/V
LACAP
2 pins should be made analog,
and the respective TRIS bits should be set as inputs.