參數(shù)資料
型號(hào): SSD1905QT2
廠商: Electronic Theatre Controls, Inc.
英文描述: LCD Graphics Controller CMOS
中文描述: LCD圖形控制器的CMOS
文件頁數(shù): 55/153頁
文件大?。?/td> 863K
代理商: SSD1905QT2
SOLOMON
Rev 1.3
10/2002
SSD1905
46
7.2.9 Pulse Width Modulation (PWM) Clock and Contrast Voltage (CV) Pulse Configuration
Registers
PWM Clock Enable
PWM Clock
Divider
Clock Source/ 2
m
PWMCLK
m = PWM Clock Divide Select value
x = CV Pulse Divide Select value
CV Pulse
Divider
Clock Source/ 2
x
PWM Clock Force High
CV Pulse Force High
CV Pulse Enable
Divided
Clock
Divided
Clock
PWM Duty Cycle
Modulation
Duty = n / 256
CV Pulse Burst
Generation
y-pulse burst
y = Burst Length value
LPWMOUT
LCVOUT
Frequency =
Clock Source / (2
m
X 256)
Frequency =
Clock Source / (2
x
X 2)
n = PWM Clock Duty Cycle
Figure 7-2 : PWM Clock/CV Pulse Block Diagram
Note
For further information on PWMCLK, see Section 11.1.4 “PWMCLK”.
PWM Clock / CV Pulse Control Register
Bit
7
6
REG[B0h]
0
5
4
3
2
1
PWM Clock
Force High
0
0
PWM Clock
Enable
RW
0
CV Pulse
Force High
RW
0
CV Pulse
Burst
Status
RO
0
CV Pulse
Burst Start
RW
0
CV Pulse
Enable
Type
Reset
state
Bit 7 and Bit 4
RW
0
NA
0
NA
0
RW
0
PWM Clock Force High (bit 7) and PWM Clock Enable (bit 4)
These bits control the LPWMOUT and PWM Clock circuitry as Table 7-14 : PWM
Clock Control.
When LPWMOUT is forced low or forced high it can be used as a general purpose
output.
Note
The PWM Clock circuitry is disabled when Power Saving Mode is enabled.
Table 7-14 : PWM Clock Control
Bit 7
0
Bit 4
1
Result
PWM Clock circuitry enabled
(controlled by REG[B1h] and REG[B3h])
LPWMOUT forced low
LPWMOUT forced high
0
1
0
x
x = don’t care
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