參數(shù)資料
型號: AT89C51CC02UA-SISUM
廠商: Atmel
文件頁數(shù): 144/159頁
文件大?。?/td> 0K
描述: IC 8051 MCU 16K FLASH 28-PLCC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 888
系列: AT89C CAN
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: CAN,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 20
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-PLCC
包裝: 管件
產(chǎn)品目錄頁面: 616 (CN2011-ZH PDF)
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
85
AT/T89C51CC02
4126L–CAN–01/08
Figure 41. General Structure of a bit Period
example of bit timing determination for CAN baudrate of 500 kbit/s:
F
OSC
= 12 MHz in X1 mode => FCAN = 6MHz
Verify that the CAN baud rate you want is an integer division of FCAN clock.
FCAN/CANbaudrate = 6 MHz/500 kHz = 12
The time quanta TQ must be comprised between 8 and 25: TQ = 12 and BRP = 0
Define the various timing parameters: Tbit = Tsyns + Tprs + Tphs1 + Tphs2 =
12TQ
Tsyns = 1TQ and Tsjw =1TQ => SJW = 0
If we chose a sample point at 66.6% => Tphs2 = 4TQ => PHS2 = 3
Tbit = 12 = 4 + 1 + Tphs1 + Tprs, let us choose Tprs = 3 Tphs1 = 4
PHS1 = 3
and PRS = 2
BRP = 0 so CANBT1 = 00h
SJW = 0 and PRS = 2 so CANBT2 = 04h
PHS2 = 3 and PHS1 = 3 so CANBT3 = 36h
bit Rate Prescaler
Oscillator
1/ Fcan
Tscl
System Clock
One Nominal bit
Tsyns (*)
Tprs
Sample Point
(*) Synchronization Segment: SYNS
Tbit
Tsyns = 1xTscl (fixed)
Data
Tbit
Tsyns
Tprs
Tphs1
Tphs2
++
+
=
Tbit calculation:
Transmission Point
Tphs1 + Tsjw (3)
Tphs2 - Tsjw (4)
(1) Phase error
≤ 0
(2) Phase error
≥ 0
(3) Phase error > 0
(4) Phase error < 0
Tphs2 (2)
Tphs1 (1)
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