ATSAM3U4CA-CU Atmel, ATSAM3U4CA-CU Datasheet - Page 694

• Manufacturer Part Number: ATSAM3U4CA-CU
• Description: IC MCU 32BIT 256KB FLSH 100TFBGA
• Manufacturer: Atmel
• Series: SAM3Ur

Specifications of ATSAM3U4CA-CU

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 96MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 57
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 52K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 4x10b, 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• Data Bus Width: 32 bit
• Data Ram Size: 52 KB
• Interface Type: 3xUSART, TWI, 4xSPI, Bus
• Maximum Clock Frequency: 96 MHz
• Number Of Programmable I/os: 57
• Number Of Timers: 8
• Operating Supply Voltage: 1.62 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3U-EK
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

35.7.1.4
Table 35-6.
Table 35-7.
Table 35-8.
694
694
DI field
Di (decimal)
FI field
Fi (decimal)
Fi/Di
16
32
12
20
1
2
4
8
SAM3U Series
SAM3U Series
Baud Rate in ISO 7816 Mode
23.25
11.62
46.5
18.6
Binary and Decimal Values for Di
Binary and Decimal Values for Fi
Possible Values for the Fi/Di Ratio
372
372
186
93
31
0000
372
0001
1
0001
139.5
69.75
34.87
17.43
372
46.5
27.9
558
558
279
system clock. In synchronous mode master (USCLKS = 0 or 1, CLK0 set to 1), the receive part
limits the SCK maximum frequency to MCK/3 in USART mode, or MCK/6 in SPI mode.
When either the external clock SCK or the internal clock divided (MCK/DIV) is selected, the
value programmed in CD must be even if the user has to ensure a 50:50 mark/space ratio on the
SCK pin. If the internal clock MCK is selected, the Baud Rate Generator ensures a 50:50 duty
cycle on the SCK pin, even if the value programmed in CD is odd.
The ISO7816 specification defines the bit rate with the following formula:
where:
Di is a binary value encoded on a 4-bit field, named DI, as represented in
Fi is a binary value encoded on a 4-bit field, named FI, as represented in
Table 35-8
baud rate clock.
If the USART is configured in ISO7816 Mode, the clock selected by the USCLKS field in the
Mode Register (US_MR) is first divided by the value programmed in the field CD in the Baud
• B is the bit rate
• Di is the bit-rate adjustment factor
• Fi is the clock frequency division factor
• f is the ISO7816 clock frequency (Hz)
0010
0010
558
2
23.25
46.5
37.2
774
744
372
186
93
62
shows the resulting Fi/Di Ratio, which is the ratio between the ISO7816 clock and the
B
0011
=
744
Di
----- -
69.75
Fi
139.5
34.87
1116
1116
55.8
558
279
0011
93
×
4
f
0100
1116
1488
1488
46.5
74.4
744
372
186
124
93
0100
0101
1488
8
232.5
116.2
58.13
1806
1860
930
465
155
93
0110
1860
0101
16
42.66
25.6
512
512
256
128
64
32
16
1001
512
0110
38.4
768
768
384
192
96
48
24
64
32
1010
768
85.33
1024
1024
51.2
512
256
128
64
32
1024
1011
1000
Table
12
Table
6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11
1536
1536
76.8
35-7.
768
384
192
128
35-6.
1100
1536
96
48
1001
20
170.6
102.4
2048
2048
1024
1101
2048
512
256
128
64