AT89C51CC01UA-RLTUM Atmel, AT89C51CC01UA-RLTUM Datasheet - Page 86

• Manufacturer Part Number: AT89C51CC01UA-RLTUM
• Description: IC 8051 MCU FLASH 32K 44-VQFP
• Manufacturer: Atmel
• Series: AT89C CANr

Specifications of AT89C51CC01UA-RLTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: CAN, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1280 B
• Interface Type: UART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 2
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: CANADAPT28
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Package: 44VQFP
• Device Core: 8051
• Family Name: AT89
• Maximum Speed: 40 MHz
• Cpu Family: AT89
• Device Core Size: 8b
• Frequency (max): 40MHz
• Total Internal Ram Size: 1.25KB
• # I/os (max): 34
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: VQFP
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT89C51CC01UARLTUM

Bit Timing and Baud Rate
Figure 47. Sample And Transmission Point
86
A/T89C51CC01
CLOCK
FCAN
Prescaler BRP
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:
•
•
•
•
•
•
•
•
The total number of TQ in a bit time has to be programmed at least from 8 to 25.
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
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.
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 equal 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.
Tphs2 = Max of (Tphs1 and 2TQ)
System clock Tscl
Time Quantum
PRS 3-bit length
PHS1 3-bit length
PHS2 3-bit length
SJW 2-bit length
Bit Timing
Sample point
Transmission point
4129N–CAN–03/08