AT91SAM9R64-CU Atmel, AT91SAM9R64-CU Datasheet - Page 447
AT91SAM9R64-CU
Manufacturer Part Number
AT91SAM9R64-CU
Description
MCU ARM9 64K SRAM 144-LFBGA
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM9R64-CU
Core Processor
ARM9
Core Size
16/32-Bit
Speed
240MHz
Connectivity
EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
AC'97, POR, PWM, WDT
Number Of I /o
49
Program Memory Size
32KB (32K x 8)
Program Memory Type
ROM
Ram Size
72K x 8
Voltage - Supply (vcc/vdd)
1.08 V ~ 1.32 V
Data Converters
A/D 3x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LFBGA
Processor Series
AT91SAMx
Core
ARM926EJ-S
Data Bus Width
32 bit
Data Ram Size
64 KB
Interface Type
2-Wire, SPI, SSC, USART
Maximum Clock Frequency
240 MHz
Number Of Programmable I/os
118
Number Of Timers
4
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, AT91SAM9RL-EK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 3 Channel
Controller Family/series
AT91SAM9xxx
No. Of I/o's
49
Ram Memory Size
64KB
Cpu Speed
240MHz
No. Of Timers
3
Rohs Compliant
Yes
Package
144LFBGA
Device Core
ARM926EJ-S
Family Name
91S
Maximum Speed
240 MHz
Operating Supply Voltage
1.8|3.3 V
For Use With
AT91SAM-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
Part Number:
AT91SAM9R64-CU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
- Current page: 447 of 903
- Download datasheet (13Mb)
Table 34-2.
34.6.1.2
6289C–ATARM–28-May-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
8 000 000
Fractional Baud Rate in Asynchronous Mode
Baud Rate Example (OVER = 0) (Continued)
Expected Baud
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
clock divider. This feature is only available when using USART normal mode. The fractional
Baud Rate is calculated using the following formula:
The modified architecture is presented below:
Baudrate
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
BaudRate
Error
=
=
---------------------------------------------------------------- -
⎛
⎝
1
8 2 Over
–
Calculation Result
=
(
⎛
⎝
ExpectedBaudRate
-------------------------------------------------- -
MCK
SelectedClock
–
ActualBaudRate
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
⁄
) CD
⎛
⎝
CD
+
×
FP
------ -
AT91SAM9R64/RL64 Preliminary
16
8
⎞
⎠
⎞
⎠
⎞
⎠
CD
13
20
20
23
24
30
39
40
40
52
53
54
65
81
Actual Baud Rate
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
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
447
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