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參數(shù)資料
| 型號(hào)： | PIC12F635T-E/SN |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, MS-012, SOIC-8 |
| 文件頁(yè)數(shù)： | 188/196頁(yè) |
| 文件大?。?/td> | 3291K |
| 代理商： | PIC12F635T-E/SN |
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2005 Microchip Technology Inc.
Preliminary
DS41232B-page 89
PIC12F635/PIC16F636/639
11.20 Soft Reset
The AFE issues a Soft Reset in the following events:
a)
After Power-on Reset (POR),
b)
After Inactivity timer time-out,
c)
If an “Abort” occurs,
d)
After receiving SPI Soft Reset command.
The “Abort” occurs if there is no positive signal
detected at the end of the AGC stabilization period
(TAGC). The Soft Reset initializes internal circuits and
brings the AFE into a low current Standby mode
operation. The internal circuits that are initialized by the
Soft Reset include:
Output Enable Filter
AGC circuits
Demodulator
32 kHz Internal Oscillator
The Soft Reset has no effect on the Configuration register
setup, except for some of the AFE Status Register 7 bits.
The circuit initialization takes one internal clock cycle
(1/32 kHz = 31.25
μs). During the initialization, the
modulation
transistors
between
each
input
and
LCCOM pins are turned-on to discharge any internal/
external parasitic charges. The modulation transistors
are turned-off immediately after the initialization time.
The Soft Reset is executed in Active mode only. It is not
valid in Standby mode.
11.21 Minimum Modulation Depth
Requirement for Input Signal
The AFE demodulates the modulated input signal if the
modulation depth of the input signal is greater than the
minimum requirement that is programmed in the AFE
Configuration Register 5 (Register 11-6). Figure 11-7
shows the definition of the modulation depth and
examples. MODMIN<6:5> of the Configuration Register
5 offer four options. They are 75%, 50%, 25% and 12%,
with a default setting of 50%.
The purpose of this feature is to enhance the
demodulation integrity of the input signal. The 12%
setting is the best choice for the input signal with weak
modulation depth, which is typically observed near the
high-voltage base station antenna and also at far-
distance from the base station antenna. It gives the
best demodulation sensitivity, but is very susceptible to
noise spikes that can result in a bit detection error. The
75% setting can reduce the bit errors caused by noise,
but gives the least demodulation sensitivity. See
Table 11-3 for minimum modulation depth requirement
settings.
TABLE 11-3:
SETTING FOR MINIMUM
MODULATION DEPTH
REQUIREMENT
MODMIN Bits
(Config. Register 5)
Modulation Depth
Bit 6
Bit 5
00
50% (default)
01
75%
10
25%
11
12%
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC12F635T-I/MD | 功能描述:8位微控制器 -MCU 2 KB 64 RAM 6I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC12F635TI/MF | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635T-I/MF | 功能描述:8位微控制器 -MCU 2kb 64 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC12F635TI/MFQTP | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635TI/P | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
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