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| 型號(hào)： | PIC16LF1527-I/MR |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 13/94頁(yè) |
| 文件大小： | 0K |
| 描述： | MCU PIC 28KB FLASH 64QFN |
| 產(chǎn)品培訓(xùn)模塊： | Configurable Logic Cell 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 40 |
| 系列： | PIC® XLP™ 16F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | I²C，LIN，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 54 |
| 程序存儲(chǔ)器容量： | 28KB（16K x 14） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 1.5K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.8 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 30x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 64-VFQFN 裸露焊盤 |
| 包裝： | 管件 |
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182
7810C–AVR–10/12
Atmel ATmega328P [Preliminary]
19.8
Asynchronous Data Reception
The USART includes a clock recovery and a data recovery unit for handling asynchronous data
reception. The clock recovery logic is used for synchronizing the internally generated baud rate
clock to the incoming asynchronous serial frames at the RxDn pin. The data recovery logic sam-
ples and low pass filters each incoming bit, thereby improving the noise immunity of the
Receiver. The asynchronous reception operational range depends on the accuracy of the inter-
nal baud rate clock, the rate of the incoming frames, and the frame size in number of bits.
19.8.1
Asynchronous Clock Recovery
The clock recovery logic synchronizes internal clock to the incoming serial frames. Figure 19-5
illustrates the sampling process of the start bit of an incoming frame. The sample rate is 16 times
the baud rate for Normal mode, and eight times the baud rate for Double Speed mode. The hor-
izontal arrows illustrate the synchronization variation due to the sampling process. Note the
larger time variation when using the Double Speed mode (U2Xn = 1) of operation. Samples
denoted zero are samples done when the RxDn line is idle (i.e., no communication activity).
Figure 19-5. Start Bit Sampling
When the clock recovery logic detects a high (idle) to low (start) transition on the RxDn line, the
start bit detection sequence is initiated. Let sample 1 denote the first zero-sample as shown in
the figure. The clock recovery logic then uses samples 8, 9, and 10 for Normal mode, and sam-
ples 4, 5, and 6 for Double Speed mode (indicated with sample numbers inside boxes on the
figure), to decide if a valid start bit is received. If two or more of these three samples have logical
high levels (the majority wins), the start bit is rejected as a noise spike and the Receiver starts
looking for the next high to low-transition. If however, a valid start bit is detected, the clock recov-
ery logic is synchronized and the data recovery can begin. The synchronization process is
repeated for each start bit.
19.8.2
Asynchronous Data Recovery
When the receiver clock is synchronized to the start bit, the data recovery can begin. The data
recovery unit uses a state machine that has 16 states for each bit in Normal mode and eight
states for each bit in Double Speed mode. Figure 19-6 shows the sampling of the data bits and
the parity bit. Each of the samples is given a number that is equal to the state of the recovery
unit.
12
34
56
7
8
9
10
11
12
13
14
15
16
12
START
IDLE
0
BIT 0
3
123
4
5
678
12
0
RxD
Sample
(U2X = 0)
Sample
(U2X = 1)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16LF1527T-I/MR | 功能描述:8位微控制器 -MCU 14KB Flash RAM 768b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度: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 |
| PIC16LF1527T-I/PT | 功能描述:8位微控制器 -MCU 14KB Flash RAM 768b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度: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 |
| PIC16LF1613-I/SL | 制造商:Microchip Technology Inc 功能描述:3.5KB FLASH, 256 RAM, 32MHZ INT. OSC, 10BIT ADC, ZCD, WWDT, - Rail/Tube 制造商:Microchip Technology Inc 功能描述:3.5KB Flash, 256 RAM, 32MHz Int. Osc, 10bit ADC, ZCD, WWDT, CRC, 14 SOIC .150in |
| PIC16LF1613-I/ST | 制造商:Microchip Technology Inc 功能描述:3.5KB FLASH, 256 RAM, 32MHZ INT. OSC, 10BIT ADC, ZCD, WWDT, - Rail/Tube 制造商:Microchip Technology Inc 功能描述:3.5KB Flash, 256 RAM, 32MHz Int. Osc, 10bit ADC, ZCD, WWDT, CRC, 14 TSSOP 4.4mm |
| PIC16LF1703-I/SL | 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 2K FLASH 14SOIC |
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