參數(shù)資料
型號(hào)： P83C570
廠商： NXP Semiconductors N.V.
英文描述： Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC
中文描述： 微控制器用于NTSC電視的屏幕顯示OSD和字幕消委會(huì)
文件頁(yè)數(shù)： 32/80頁(yè)
文件大?。?/td> 266K
代理商： P83C570
1999 Jun 11
32
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
16 AFT INPUTS (ADC)
The P8xCx70 has 3 ADC channels each with 4-bit resolution. One channel is intended to measure the level of the key
pad signals. This is achieved by comparing the AFT signal with the output of a 4-bit DAC.
The compare time of the AFT is not greater than 8
μ
s at 12 MHz. Adding NOP instructions is recommended in between
the instructions which change the reference voltage or channel and the instructions which read the AFTC register bit.
Ensure that pins 9, 10 and 11 are configured as AFT functions before use (see Chapter 14).
The conversion time (T
AFC
) of an AFT (4-bit output) is calculated as shown below.
where:
T
AFC
T
CPU
8
+
(
)
4
μ
s
×
=
T
CPU
number of instructions to program 4-bit DAC
(
)
instruction cycle time
(
)
×
=
Fig.11 AFT block diagram.
handbook, full pagewidth
4-BIT DAC
COMPARATOR
AFTL3
AFTL2
AFTL1
AFTL0
AFTH0
AFTH1
AFT2E
AFT1E
AFT0E
MGL596
AFT
CHANNEL
SELECTOR
P1.2/AFT2
P1.1/AFT1
P1.0/AFT0
Vref
EN
DERIVATIVE PORT
SELECTOR
EN1
EN2
AFTC
Internal bus
Internal bus
Channel selection
(SFR address EAH)
EN0
AFT function enable
(SFR address F4H)
(SFR address EAH)
(SFR address EAH)
3
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P83C770 Microcontrollers for NTSC TVs with On-Screen Display (OSD) and Closed Caption (CC)(在NTSC TV中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點(diǎn)的微控制器)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P83C570AAR 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC
P83C575EBA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
P83C575EBAA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer
P83C575EBB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
P83C575EBBB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer
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