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參數(shù)資料
| 型號(hào)： | PCA84C840 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontrollers with OSD and VST(帶OSD 和 VST的8位微控制器) |
| 中文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP42 |
| 文件頁(yè)數(shù)： | 10/40頁(yè) |
| 文件大小： | 233K |
| 代理商： | PCA84C840 |
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1996 Nov 29
10
Philips Semiconductors
Product specification
8-bit microcontrollers with OSD and VST
84C44X; 84C64X; 84C84X
8
ANALOG CONTROL
8.1
6-bit PWM DACs
Five PWM outputs are available for analog control
purposes e.g. volume, balance, brightness, saturation, etc.
The block diagram of a typical 6-bit PWM DAC is shown in
Fig.8. Each PWM output can generate pulses of
programmable length that have a repetition frequency of
1
64
×
f
PWM
, where f
PWM
=
1
3
×
f
XTAL
.
8.1.1
P
IN SELECTION FOR
PWM
OUTPUTS
The PWM outputs
PWM1 to PWM5
, share the same pins
as the
Derivative Port lines DP0.1 to DP0.5
.
Setting the (relevant PWM enable) bit PWMnE to:
Logic 1, selects the relevant PWMx output function
Logic 0, selects the relevant DP0.x Port function.
8.1.2
P
OLARITY OF THE
PWM
OUTPUTS
The polarity of all five PWM outputs is selected by the state
of the polarity control bit P6LVL.
Setting the control bit P6LVL to:
Logic 0, sets the PWMx outputs to the default polarity
Logic 1, inverts all the PWMx outputs.
8.1.3
A
NALOG OUTPUT VOLTAGE
A DC voltage proportional to the PWM control setting may
be obtained by connecting an integrating network to each
of the PWM outputs (see Fig.9).
The analog value is calculated as follows:
Where:
t
HIGH
PWMDL is the decimal value of the contents of the
PWM data latch.
Therefore, the analog output voltage is:
V
A
t
t
r
-------------
V
O
×
=
t
0
PWMDL
×
HIGH time of the PWM pulse
=
=
t
r
t
0
64
×
repetition time of the PWM pulse
=
=
t
0
f
XTAL
----3
=
V
A
64
PWMDL
V
O
×
=
Fig.8 Block diagram of the 6-bit PWM DAC.
handbook, full pagewidth
MCD176
DP0.x data
I/O
DP0.x/PWMx
6-BIT PWM DATA LATCH
P6LVL
PWMnE
6-BIT DAC PWM
CONTROLLER
Q
Q
polarity control bit
fPWM
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| PCA84C840P/054 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-bit microcontrollers with OSD and VST(265.86 k) |
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| PCA84C844 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with OSD and VST |
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