AT91SAM9260B-QU Atmel, AT91SAM9260B-QU Datasheet - Page 432
AT91SAM9260B-QU
Manufacturer Part Number
AT91SAM9260B-QU
Description
IC ARM9 MCU 208-PQFP
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM9260B-QU
Core Processor
ARM9
Core Size
16/32-Bit
Speed
180MHz
Connectivity
EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
POR, WDT
Number Of I /o
96
Program Memory Size
32KB (32K x 8)
Program Memory Type
ROM
Ram Size
24K x 8
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
208-MQFP, 208-PQFP
Package
208PQFP
Device Core
ARM926EJ-S
Family Name
91S
Maximum Speed
180 MHz
Operating Supply Voltage
1.8|3.3 V
Data Bus Width
32 Bit
Number Of Programmable I/os
96
Interface Type
EBI/Ethernet/SPI/TWI/UART/USART/USB
On-chip Adc
4-chx10-bit
Number Of Timers
6
Processor Series
AT91SAMx
Core
ARM926EJ-S
Data Ram Size
8 KB
Maximum Clock Frequency
180 MHz
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
AT91SAM-ICE, AT91-ISP, AT91SAM9260-EK
Minimum Operating Temperature
- 40 C
Cpu Family
AT91
Device Core Size
32b
Frequency (max)
180MHz
Total Internal Ram Size
8KB
# I/os (max)
96
Number Of Timers - General Purpose
6
Operating Supply Voltage (typ)
1.8/3.3V
Operating Supply Voltage (max)
1.95/3.6V
Operating Supply Voltage (min)
1.65/3V
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
208
Package Type
PQFP
For Use With
AT91SAM9260-EK - KIT EVAL FOR AT91SAM9260AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT91SAM9260B-QU
Manufacturer:
ATMEL
Quantity:
2 000
Company:
Part Number:
AT91SAM9260B-QU
Manufacturer:
ATMEL
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- Current page: 432 of 798
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31.7.1.2
Table 31-2.
31.7.1.3
6221I–ATARM–17-Jul-09
Source Clock
12 000 000
12 288 000
14 318 180
14 745 600
18 432 000
24 000 000
24 576 000
25 000 000
32 000 000
32 768 000
33 000 000
40 000 000
50 000 000
3 686 400
4 915 200
5 000 000
7 372 800
8 000 000
MHz
Baud Rate Calculation Example
Fractional Baud Rate in Asynchronous Mode
Baud Rate Example (OVER = 0)
Expected Baud
Table 31-2
clock frequencies. This table also shows the actual resulting baud rate and the error.
The baud rate is calculated with the following formula:
The baud rate error is calculated with the following formula. It is not recommended to work with
an error higher than 5%.
The Baud Rate generator previously defined is subject to the following limitation: the output fre-
quency changes by only integer multiples of the reference frequency. An approach to this
problem is to integrate a fractional N clock generator that has a high resolution. The generator
architecture is modified to obtain Baud Rate changes by a fraction of the reference source clock.
This fractional part is programmed with the FP field in the Baud Rate Generator Register
(US_BRGR). If FP is not 0, the fractional part is activated. The resolution is one eighth of the
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
38 400
Rate
Bit/s
BaudRate
Error
shows calculations of CD to obtain a baud rate at 38400 bauds for different source
=
1
–
Calculation Result
=
⎛
⎝
ExpectedBaudRate
-------------------------------------------------- -
MCK
ActualBaudRate
12.00
13.02
19.53
20.00
23.30
24.00
30.00
39.06
40.00
40.69
52.08
53.33
53.71
65.10
81.38
6.00
8.00
8.14
⁄
CD
×
16
⎞
⎠
CD
12
13
20
20
23
24
30
39
40
40
52
53
54
65
81
6
8
8
Actual Baud Rate
38 400.00
38 400.00
39 062.50
38 400.00
38 461.54
37 500.00
38 400.00
38 908.10
38 400.00
38 400.00
38 461.54
38 400.00
38 109.76
38 461.54
38 641.51
38 194.44
38 461.54
38 580.25
Bit/s
AT91SAM9260
0.00%
0.00%
1.70%
0.00%
0.16%
2.40%
0.00%
1.31%
0.00%
0.00%
0.16%
0.00%
0.76%
0.16%
0.63%
0.54%
0.16%
0.47%
Error
432
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