AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 602

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

33.7.8.8
6438F–ATARM–21-Jun-10
Identifier Parity
F
LIN Standard imposes that it must not exceed ±15%. The LIN Standard imposes also that for
communication between two nodes, their bit rate must not differ by more than ±2%. This means
that the Baudrate_deviation must not exceed ±1%.
It follows from that, a minimum value for the nominal clock frequency:
Examples:
If the fractional baud rate is not used, the accuracy of the synchronization becomes much lower.
When the counter is stopped, the 16 most significant bits of the counter (value divided by 8)
gives the new clock divider (CD). This value is rounded by adding the first insignificant bit. The
equation of the Baudrate deviation is the same as given above, but the constants are as follows:
value for the nominal clock frequency:
Examples:
A protected identifier consists of two sub-fields; the identifier and the identifier parity. Bits 0 to 5
are assigned to the identifier and bits 6 and 7 are assigned to the parity.
TOL_UNSYNCH
• Baudrate = 20 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 20 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 1 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 1 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 20 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 20 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 1 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 1 kbit/s, Over=1 (Oversampling 8X) => F
is the deviation of the real slave node clock from the nominal clock frequency. The
Baudrate_deviation
Baudrate_deviation
F
F
NOM
NOM
(min)
min
=
=
100
100
=
=
------------------------------------------------------------------------------------------ - Hz
4
----------------------------------------------------------------------------------------------- - Hz
0.5
100
100
–
–
8
4
0.5
8
8
2 Over
-------------------------------------------------------------------------------------------- - %
-------------------------------------------------------------------------------------------- - %
–
8
–
--------- -
100
+4
15
2 Over
8
–
+0.5
8
8
–
--------- -
100
+
15
1
-1
+
F
-------------------------------------- - xF
1
2 Over
2 Over
+
TOL_UNSYNCH
Nom
Nom
–
–
1%
1
8
-1
Nom
Nom
Nom
Nom
+
Baudrate
Nom
Nom
(min) = 74 kHz
(min) = 485 kHz
100
1
+1
(min) = 1.47 MHz
(min) = 132 kHz
(min) = 9.71 MHz
(min) = 956 kHz
F
1%
(min) = 2.64 MHz
(min) = 19.12 MHz
SLAVE
It follows from that, a minimum
Baudrate
+
+
+1
AT91SAM9G45
Baudrate
Baudrate
Nom
602