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| 型号： | P83C570 |
| 厂商： | 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电视的屏幕显示OSD和字幕消委会 |
| 文件页数： | 32/80页 |
| 文件大小： | 266K |
| 代理商： | P83C570 |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| P83C570AAR | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC |
| P83C575EBA | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P83C575EBAA | 制造商:PHILIPS 制造商全称: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:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P83C575EBBB | 制造商:PHILIPS 制造商全称: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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