参数资料
型号: PIC18LF2520-I/SP
厂商: Microchip Technology
文件页数: 68/151页
文件大小: 0K
描述: IC MCU FLASH 16KX16 28-DIP
产品培训模块: Asynchronous Stimulus
标准包装: 15
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 25
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 1.5K x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 10x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-DIP(0.300",7.62mm)
包装: 管件
产品目录页面: 643 (CN2011-ZH PDF)
2011-2012 Microchip Technology Inc.
Preliminary
DS41579C-page 335
PIC16(L)F1782/3
27.4.1
AUTO-BAUD DETECT
The EUSART module supports automatic detection
and calibration of the baud rate.
In the Auto-Baud Detect (ABD) mode, the clock to the
BRG is reversed. Rather than the BRG clocking the
incoming RX signal, the RX signal is timing the BRG.
The Baud Rate Generator is used to time the period of
a received 55h (ASCII “U”) which is the Sync character
for the LIN bus. The unique feature of this character is
that it has five rising edges including the Stop bit edge.
Setting the ABDEN bit of the BAUDCON register starts
the auto-baud calibration sequence (Figure 27-6).
While the ABD sequence takes place, the EUSART
state machine is held in Idle. On the first rising edge of
the receive line, after the Start bit, the SPBRG begins
counting up using the BRG counter clock as shown in
Table 27-6. The fifth rising edge will occur on the RX pin
at the end of the eighth bit period. At that time, an
accumulated value totaling the proper BRG period is
left in the SPBRGH, SPBRGL register pair, the ABDEN
bit is automatically cleared and the RCIF interrupt flag
is set. The value in the RCREG needs to be read to
clear the RCIF interrupt. RCREG content should be
discarded. When calibrating for modes that do not use
the SPBRGH register the user can verify that the
SPBRGL register did not overflow by checking for 00h
in the SPBRGH register.
The BRG auto-baud clock is determined by the BRG16
and BRGH bits as shown in Table 27-6. During ABD,
both the SPBRGH and SPBRGL registers are used as
a 16-bit counter, independent of the BRG16 bit setting.
While calibrating the baud rate period, the SPBRGH
and SPBRGL registers are clocked at 1/8th the BRG
base clock rate. The resulting byte measurement is the
average bit time when clocked at full speed.
TABLE 27-6:
BRG COUNTER CLOCK RATES
FIGURE 27-6:
AUTOMATIC BAUD RATE CALIBRATION
Note 1:
If the WUE bit is set with the ABDEN bit,
auto-baud detection will occur on the byte
following the Break character (see
2:
It is up to the user to determine that the
incoming character baud rate is within the
range of the selected BRG clock source.
Some combinations of oscillator frequency
and EUSART baud rates are not possible.
3:
During
the
auto-baud
process,
the
auto-baud counter starts counting at 1.
Upon
completion
of
the
auto-baud
sequence, to achieve maximum accuracy,
subtract 1 from the SPBRGH:SPBRGL reg-
ister pair.
BRG16
BRGH
BRG Base
Clock
BRG ABD
Clock
00
FOSC/64
FOSC/512
01
FOSC/16
FOSC/128
10
FOSC/16
FOSC/128
11
FOSC/4
FOSC/32
Note:
During the ABD sequence, SPBRGL and
SPBRGH registers are both used as a 16-bit
counter, independent of BRG16 setting.
BRG Value
RX pin
ABDEN bit
RCIF bit
bit 0
bit 1
(Interrupt)
Read
RCREG
BRG Clock
Start
Auto Cleared
Set by User
XXXXh
0000h
Edge #1
bit 2
bit 3
Edge #2
bit 4
bit 5
Edge #3
bit 6
bit 7
Edge #4
Stop bit
Edge #5
001Ch
Note 1:
The ABD sequence requires the EUSART module to be configured in Asynchronous mode.
SPBRGL
XXh
1Ch
SPBRGH
XXh
00h
RCIDL
相关PDF资料
PDF描述
PIC24HJ128GP206A-I/PT IC PIC MCU FLASH 128KB 64-TQFP
PIC18LF4423-I/P IC PIC MCU FLASH 8KX16 40DIP
213684-1 34P PLUG KIT,M-SERIES,CC,JS
PIC18LF2455-I/SO IC PIC MCU FLASH 12KX16 28SOIC
DSPIC33FJ64GP204-E/PT IC DSPIC MCU/DSP 64K 44-TQFP
相关代理商/技术参数
参数描述
PIC18LF2520T-I/ML 功能描述:8位微控制器 -MCU 32KB 1536 RAM 25I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF2520T-I/SO 功能描述:8位微控制器 -MCU 32KB 1536 RAM 25I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF2523-I/ML 功能描述:8位微控制器 -MCU 32KB 1536bytes-RAM 25I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF2523-I/SO 功能描述:8位微控制器 -MCU 32KB 1536bytes-RAM 25I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF2523-I/SO 制造商:Microchip Technology Inc 功能描述:8-BIT MICROCONTROLLER IC