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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： | 37/84页 |
| 文件大小： | 420K |
| 代理商： | P83C880 |
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1997 Dec 12
37
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
8.
For the DAC = 0100 case.
If COMP = 1; then the analog input voltage is now
greater than V
ref
and therefore the digital input to the
DAC needs to be increased. Set the input to the DAC
to 0110.
If COMP = 0; then the analog input voltage is still lower
than V
ref
and therefore the digital input to the DAC
needs to be decreased again. Set the input to the DAC
to 0010.
9.
The operations detailed in 5, 6 and 7 above are
repeated and each time the digital input to the DAC is
changed accordingly; as dictated by the state of the
COMP bit.
The complete process is shown in Fig.21. Each time
the DAC input is changed the number of values which
the analog input can take is reduced by half. In this
manner the actual analog value is honed into. The
value of the analog input (V
A
) is determined by the
formulae:
V
16
As the conversion time of each compare operation is
greater than 6
μ
s but less than 9
μ
s; a NOP instruction is
recommended to be used in between the instructions that
select V
ref
; the ADC channel and read the COMP bit.
V
A
----------
DAC value
1
+
(
)
×
=
Fig.20 Block diagram of the ADC.
handbook, full pagewidth
4-BIT DAC
COMPARATOR
DAC3
DAC2
DAC1
DAC0
ADCE
DACHL
MGG049
ADC enable selection
DAC value selection
ENABLE
SELECTOR
ADC
CHANNEL
SELECTOR
P3.2/ADC0
P3.3/ADC1
Vref
EN
PORT INTERFACE
EN1
EN0
MOV A, ADCDAT
instruction
to read COMP bit
COMP bit
internal bus
channel selection
+
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