AT32UC3B1256-Z1UR Atmel, AT32UC3B1256-Z1UR Datasheet - Page 308

• Manufacturer Part Number: AT32UC3B1256-Z1UR
• Description: MCU AVR32 256K FLASH 48-QFN
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3B1256-Z1UR

• Package / Case: 48-QFN Exposed Pad
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 60MHz
• Number Of I /o: 28
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Program Memory Size: 256KB (256K x 8)
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Connectivity: I²C, IrDA, SPI, SSC, UART/USART, USB
• Core Size: 32-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

21.6.1.5
Table 21-4.
Table 21-5.
Table 21-6.
32059J–12/2010
DI field
Di (decimal)
FI field
Fi (decimal
Fi/Di
16
32
12
20
1
2
4
8
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
0000
93
31
372
0001
1
0001
139.5
69.75
34.87
17.43
372
46.5
27.9
558
558
279
The ISO7816 specification defines the bit rate with the following formula:
where:
• 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)
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 21-6
baud rate clock.
If the USART is configured in ISO7816 Mode, the clock selected by the USCLKS field in the
Mode Register (MR) is first divided by the value programmed in the field CD in the Baud Rate
Generator Register (BRGR). The resulting clock can be provided to the CLK pin to feed the
smart card clock inputs. This means that the CLKO bit can be set in MR.
This clock is then divided by the value programmed in the FI_DI_RATIO field in the FI_DI_Ratio
register (FIDI). This is performed by the Sampling Divider, which performs a division by up to
2047 in ISO7816 Mode. The non-integer values of the Fi/Di Ratio are not supported and the user
must program the FI_DI_RATIO field to a value as close as possible to the expected value.
The FI_DI_RATIO field resets to the value 0x174 (372 in decimal) and is the most common
divider between the ISO7816 clock and the bit rate (Fi = 372, Di = 1).
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
139.5
69.75
34.87
Di
----- -
Fi
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
1011
1024
1000
Table
12
Table
AT32UC3B
1536
1536
76.8
21-5.
768
384
192
128
21-4.
1100
1536
96
48
1001
20
170.6
102.4
1101
2048
2048
2048
1024
512
256
128
64
308