AT91SAM9G45-CU-999 Atmel, AT91SAM9G45-CU-999 Datasheet - Page 602
AT91SAM9G45-CU-999
Manufacturer Part Number
AT91SAM9G45-CU-999
Description
IC MCU ARM9 APMC 324TFBGA
Manufacturer
Atmel
Series
AT91SAMr
Datasheet
1.AT91SAM9G45-EKES.pdf
(1218 pages)
Specifications of AT91SAM9G45-CU-999
Core Processor
ARM9
Core Size
16/32-Bit
Speed
400MHz
Connectivity
EBI/EMI, Ethernet, I²C, IrDA, MMC, SPI, SSC, UART/USART, USB
Peripherals
AC'97, DMA, I²S, LCD, POR, PWM, WDT
Number Of I /o
160
Program Memory Size
64KB (64K x 8)
Program Memory Type
ROM
Ram Size
128K x 8
Voltage - Supply (vcc/vdd)
0.9 V ~ 1.1 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
324-TFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Supplier Unconfirmed
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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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
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