T89C51CC01CA-RLTIM Atmel, T89C51CC01CA-RLTIM Datasheet - Page 87
T89C51CC01CA-RLTIM
Manufacturer Part Number
T89C51CC01CA-RLTIM
Description
IC 8051 MCU FLASH 32K 44VQFP
Manufacturer
Atmel
Series
AT89C CANr
Datasheets
1.T89C51CC01CA-7CTIM.pdf
(167 pages)
2.T89C51CC01CA-7CTIM.pdf
(12 pages)
3.T89C51CC01CA-7CTIM.pdf
(32 pages)
4.T89C51CC01CA-7CTIM.pdf
(29 pages)
Specifications of T89C51CC01CA-RLTIM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
32
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
For Use With
AT89STK-06 - KIT DEMOBOARD 8051 MCU W/CAN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
T89C51CC01CARLTIM
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Figure 48. General Structure of a Bit Period
4129N–CAN–03/08
(1) Phase error ≤ 0
(2) Phase error ≥ 0
(3) Phase error > 0
(4) Phase error < 0
system clock
oscillator
data
Tsyns (*)
example of bit timing determination for CAN baudrate of 500kbit/s:
Fosc = 12 MHz in X1 mode => FCAN = 6 MHz
Verify that the CAN baud rate you want is an integer division of FCAN clock.
FCAN/CAN baudrate = 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
(*) Synchronization Segment: SYNS
1/ Fcan
Tsyns = 1xTscl (fixed)
Tscl
Tbit calculation:
Tprs
one nominal bit
Bit Rate Prescaler
Tbit
Tbit
Tphs1 + Tsjw (3)
=
Tphs1 (1)
Tsyns
Sample Point
+
Tprs
Tphs2 - Tsjw (4)
+
Tphs1
Tphs2 (2)
Transmission Point
+
Tphs2
87
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