參數(shù)資料
型號: AT89C51CC02UA-RATUM
廠商: Atmel
文件頁數(shù): 143/159頁
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 32-VQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 1,250
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?。?/td> 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: 32-LQFP
包裝: 托盤
產(chǎn)品目錄頁面: 616 (CN2011-ZH PDF)
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
84
AT/T89C51CC02
4126L–CAN–01/08
Bit Timing and Baud
Rate
FSM’s (Finite State Machine) of the CAN channel need to be synchronous to the time
quantum. So, the input clock for bit timing is the clock used into CAN channel FSM’s.
Field and segment abbreviations:
BRP: Baud Rate Prescaler.
TQ: Time Quantum (output of Baud Rate Prescaler).
SYNS: SYNchronization Segment is 1 TQ long.
PRS: PRopagation time Segment is programmable to be 1, 2, ..., 8 TQ long.
PHS1: PHase Segment 1 is programmable to be 1, 2, ..., 8 TQ long.
PHS2: PHase Segment 2 is programmable to be superior or eual to the Information
Processing Time and inferior or equal to TPHS1
INFORMATION PROCESSING TIME is 2 TQ.
SJW: (Re) Synchronization Jump Width is programmable to be minimum of PHS1
and 4.
The total number of TQ in a bit time has to be programmed at least from 8 to 25.
Figure 40. Sample and Transmission Point
The baud rate selection is made by Tbit calculation:
Tbit = Tsyns + Tprs + Tphs1 + Tphs2
1.
Tsyns = Tscl = (BRP[5..0]+ 1)/Fcan = 1TQ
2.
Tprs = (1 to 8) * Tscl = (PRS[2..0]+ 1) * Tscl
3.
Tphs1 = (1 to 8) * Tscl = (PHS1[2..0]+ 1) * Tscl
4.
Tphs2 = (1 to 8) * Tscl = (PHS2[2..0]+ 1) * Tscl
Tphs2 = Max of (Tphs1 and 2TQ)
5.
Tsjw = (1 to 4) * Tscl = (SJW[1..0]+ 1) * Tscl
The total number of Tscl (Time Quanta) in a bit time must be comprised between 8 to
25.
FCAN
CLOCK
Prescaler BRP
PRS 3bit length
PHS1 3bit length
PHS2 3bit length
SJW 2-bit length
bit Timing
System Clock Tscl
Time Quantum
Sample Point
Transmission Point
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