AT89C51CC01 Atmel Corporation, AT89C51CC01 Datasheet - Page 87
AT89C51CC01
Manufacturer Part Number
AT89C51CC01
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89C51CC01.pdf
(167 pages)
2.AT89C51CC01.pdf
(12 pages)
3.AT89C51CC01.pdf
(32 pages)
4.AT89C51CC01.pdf
(29 pages)
Specifications of AT89C51CC01
Flash (kbytes)
32 Kbytes
Max. Operating Frequency
40 MHz
Cpu
8051-12C
Max I/o Pins
34
Uart
1
Can
1
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
62.5
Sram (kbytes)
1.25
Eeprom (bytes)
2048
Self Program Memory
API
Operating Voltage (vcc)
3.0 to 5.5
Timers
4
Isp
UART/CAN
Watchdog
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51CC01CA-IM
Manufacturer:
ATMEL
Quantity:
831
Company:
Part Number:
AT89C51CC01CA-RLTUM
Manufacturer:
ATMEL
Quantity:
4 000
Company:
Part Number:
AT89C51CC01CA-RLTUM
Manufacturer:
Atmel
Quantity:
3 136
Company:
Part Number:
AT89C51CC01CA-SLIM
Manufacturer:
ATMEL
Quantity:
11
Company:
Part Number:
AT89C51CC01CA-SLSUM
Manufacturer:
ATMEL
Quantity:
2 916
Part Number:
AT89C51CC01UA-RLTUM
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
AT89C51CC01UA-UM
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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