19-32
MC9328MX1 Reference Manual
MOTOROLA
LCD Controller
19.4.12 PWM Contrast Control Register
The PWM Contrast Control Register is used to control the signal output at the CONTRAST pin, which
controls the contrast of the LCD panel.
PWMR
PWM Contrast Control Register
Addr
0x0020502C
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CLS_HI_WIDTH
TYPE
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
LD
MSK
SCR
CC_EN
PW
TYPE
rw
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 19-20. PWM Contrast Control Register Description
Name
Description
Settings
Reserved
Bits 31–25
Reserved—These bits are reserved and should read 0.
CLS_HI_
WIDTH
Bit 24–16
CLS High Pulse Width
—Controls the Hi Pulse width of CLS in units of SCLK. The actual pulse width
= CLS_HI1.
LDMSK
Bit 15
LD Mask
—Enables/Disables the LD output to zero for the Sharp
TFT panel power-off sequence.
0 = LD [15:0] is normal
1 = LD [15:0] always equals 0
Reserved
Bits 14–11
Reserved—These bits are reserved and should read 0.
SCR
Bits 10–9
Source Select
—Selects the input clock source for the PWM
counter. The PWM output frequency is equal to the frequency of the
input clock divided by 256.
00 = Line pulse
01 = Pixel clock
10 = LCD clock
11 = Reserved
CC_EN
Bit 8
Contrast Control Enable
—Enables/Disables the contrast control
function.
0 = Contrast control is off
1 = Contrast control is on
PW
Bits 7–0
Pulse-Width
—Controls the pulse-width of the built-in pulse-width modulator, which controls the
contrast of the LCD screen.
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