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| 型号： | P83C880 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc(带DDC接口，同步监测和同步处理的监视器微控制器) |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42 |
| 文件页数： | 30/84页 |
| 文件大小： | 420K |
| 代理商： | P83C880 |
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1997 Dec 12
30
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
14 ANALOG CONTROL (DC)
The P83C880 has eleven Pulse Width Modulated (PWM)
outputs for analog control purposes e.g. brightness,
contrast, E-W, R (or G or B) gain control etc. Each PWM
output generates a pulse pattern with a programmable
duty cycle.
The eleven PWM outputs comprise:
10 PWM outputs with 8-bit resolution (PWM0 to PWM9);
described in Section 14.1.
1 PWM output with 14-bit resolution (PWM10);
described in Section 14.2.
A typical PWM output application is described in
Section 14.3.
14.1
8-bit PWM outputs (PWM0 to PWM9)
PWM outputs PWM0 to PWM9 share the same pins as
port lines P2.0 to P2.7, P3.0 and P3.1 respectively.
Selection of the pin function as either a PWM output or a
port line is achieved using the appropriate PWMnE bit in
SFRs, PWME1 (address C8H) and PWME2 (address
E8H); see Table 4.
The polarity of the PWM outputs is programmable and is
selected by the P8LVL bit in SFR DFCON (address C0H);
see Table 4.
The duty cycle of outputs PWM0 to PWM9 is dependent
on the programmable contents of the data latches: SFRs
PWM0 to PWM9. As the clock frequency of each PWM
circuit is
1
4
f
clk
, the pulse width of the pulse generated can
be calculated as:
Where (PWMn) is the decimal value held in the relevant
data latch.
The maximum repetition frequency of the 8-bit PWM
f
1024
outputs is:
The block diagram for the 8-bit PWM outputs is shown in
Fig.13.
Pulse width
4
PWMn
f
clk
(
)
×
=
f
PWM
------------
=
Fig.13 Block diagram for 8-bit PWMs.
handbook, full pagewidth
MGG042
P2.x/P3.x data I/O
P2.x/P3.x/PWMn
8-BIT PWM DATA LATCH
P8LVL
internal data bus
PWMnE
8-BIT DAC PWM
CONTROLLER
Q
Q
fclk
4
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