AT32UC3L064_1 ATMEL [ATMEL Corporation], AT32UC3L064_1 Datasheet - Page 381

• Manufacturer Part Number: AT32UC3L064_1
• Description: AVR32 32-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

20.7.1.5
Table 20-4.
Table 20-5.
Table 20-6.
32099A–AVR32–06/09
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
When either the external clock CLK or the internal clock divided (CLK_USART/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 CLK pin. If the internal clock CLK_USART is selected, the Baud Rate Generator ensures a
50:50 duty cycle on the CLK 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
381.
Fi is a binary value encoded on a 4-bit field, named FI, as represented in
381.
Table 20-6 on page 381
clock and the 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.
• 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
B
0011
=
744
139.5
69.75
34.87
Di
----- -
Fi
1116
1116
55.8
558
279
0011
93
×
4
f
shows the resulting Fi/Di Ratio, which is the ratio between the ISO7816
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
12
AT32UC3L
Table 20-5 on page
Table 20-4 on page
1536
1536
76.8
768
384
192
128
1100
1536
96
48
1001
20
170.6
102.4
1101
2048
2048
2048
1024
512
256
128
64
381