- 您现在的位置：买卖IC网 > PDF目录367726 > P87C380 (NXP SEMICONDUCTORS) 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) PDF资料下载
参数资料
| 型号： | P87C380 |
| 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, OTPROM, 16 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42 |
| 文件页数： | 36/84页 |
| 文件大小： | 420K |
| 代理商： | P87C380 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页当前第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页
1997 Dec 12
36
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
15 ANALOG-TO-DIGITAL CONVERTER (ADC)
The ADC inputs ADC0 and ADC1 share the same pins as
port lines P3.2 and P3.3 respectively. Selection of the pin
function as either an ADC input or as a port line is achieved
using bit ADCE in SFR DFCON (address C0H). When
ADCE = 1, the ADC function is enabled; see Section 7.3.2,
Table 8.
The two channel ADC comprises a 4-bit Digital-to-Analog
Converter (DAC); a comparator; an analog channel
selector and control circuitry. As the digital input to the 4-bit
DAC is loaded by software (a subroutine in the program),
it is known as a software ADC. The block diagram is shown
in Fig.20.
The 4-bit DAC analog output voltage (V
ref
) is determined
by the decimal value of the data held in bits DAC0 to DAC3
(DAC value) of SFR ADCDAT (address C1H). V
ref
is
V
calculated as:
Table 31 lists the V
ref
values as function of DAC3 to DAC0.
When the analog input voltage is higher than V
ref
, the
COMP bit in SFR ADCDAT (address C1H) will be HIGH.
The channel selector, consisting of two analog switches, is
controlled by bit DACHL in SFR ADCDAT; see Table 32.
Table 31
Selection of V
ref
DAC3
DAC2
DAC1
DAC0
V
ref
(V)
1
16
×
V
DD
2
16
×
V
DD
3
16
×
V
DD
4
16
×
V
DD
5
16
×
V
DD
6
16
×
V
DD
7
16
×
V
DD
8
16
×
V
DD
9
16
×
V
DD
10
16
×
V
DD
11
16
×
V
DD
12
16
×
V
DD
13
16
×
V
DD
14
16
×
V
DD
15
16
×
V
DD
V
DD
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
V
ref
--16
DAC value
1
+
(
)
×
=
Table 32
Selection of ADC channel
15.1
Conversion algorithm
There are many algorithms available to achieve the ADC
conversion. The algorithm described below and shown in
Fig.21 uses an iteration process.
1.
Select ADCn channel for conversion. Channel
selection is achieved using bit DACHL, SFR ADCDAT
(address C1H).
2.
Set the digital input to the DAC to 1000. The digital
input to the DAC is selected using bits DAC3 to DAC0
(SFR ADCDAT).
3.
Determine the result of the compare operation. This is
achieved by reading the COMP bit in SFR ADCDAT
using the instruction ‘MOV A, ADCDAT’. If COMP = 1;
the analog input voltage is higher than the reference
voltage (V
ref
). If COMP = 0; the analog input voltage is
lower than the reference voltage (V
ref
).
4.
If COMP = 1; then the analog input voltage is higher
than the reference voltage (V
ref
) and therefore the
digital input to the DAC needs to be increased. Set the
input to the DAC to 1100.
5.
If COMP = 0; then the analog input voltage is lower
than the reference voltage (V
ref
) and therefore the
digital input to the DAC needs to be decreased. Set the
input to the DAC to 0100.
6.
Determine the result of the compare operation by
reading the COMP bit in SFR ADCDAT.
7.
For the DAC = 1100 case.
If COMP = 1; then the analog input voltage is still
greater than V
ref
and therefore the digital input to the
DAC needs to be increased again. Set the input to the
DAC to 1110.
If COMP = 0; then the analog input voltage is now less
than V
ref
and therefore the digital input to the DAC
needs to be decreased. Set the input to the DAC to
1010.
DACHL
CHANNEL SELECTED
0
1
ADC0
ADC1
相关PDF资料 |
PDF描述 |
|---|---|
| P83C880 | 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) |
| P83C180 | 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) |
| P83C370AAR | Microcontrollers for PAL/SECAM TV with OSD and VST(带 OSD和 VST的在PAL/SECAM TV中应用的微控制器) |
| P83C570AAR | Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC |
| P83C570 | Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P87C380AERF | 制造商:NXP Semiconductors 功能描述: |
| P87C38X2 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz |
| P87C42 | 功能描述:IC MCU UNIV PERIF INTERFAC 40DIP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:87C42 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C，IrDA，LIN，SPI，UART/USART 外围设备:DMA，PDR，POR，PVD，PWM，温度传感器，WDT 输入/输出数:26 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN，36-VFQFPN 包装:托盘 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名称:497-9032STM32F101T8U6-ND |
| P87C453EBAA | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:CMOS single-chip 8-bit microcontrollers |
| P87C453EBL | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
发布紧急采购，3分钟左右您将得到回复。