AT94K05AL ATMEL Corporation, AT94K05AL Datasheet - Page 127

• Manufacturer Part Number: AT94K05AL
• Description: Fpslic Devices Combine 5K Gates of Atmel's Patented AT40K Fpga Architecture, a 20 Mips Avr 8-bit Risc Microprocessor Core, Numerous Fixed Microcontroller Peripheries And up to 36K Bytes of Program And Data SRAM.
• Manufacturer: ATMEL Corporation

Table 35. UBR Settings at Various Crystal Frequencies
Rev. 1138F–FPSLI–06/02
Clock
MHz
Clock
MHz
Clock
MHz
25.576 0010
9.216 0000
1 0000
UBRRHI
7:4 or 3:0 UBRRn
0000
0000
0000
0000
0000
0000
0000
0000
0000
UBRRHI
7:4 or 3:0 UBRRn
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
UBRRHI
7:4 or 3:0 UBRRn
0001
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
00011001
00001100
00000110
00000011
00000010
00000001
00000001
00000000
00000000
00000000
11101111
01110111
00111011
00100111
00011101
00010011
00001110
00001001
00000111
00000100
00000001
00000000
00000000
10011001
01001100
10100110
01101110
01010010
00110110
00101001
00011011
00010100
00001101
00000110
00000011
00000001
UBR
HEX
019
00C
006
003
002
001
001
000
000
000
UBR
HEX
0EF
077
03B
027
01D
013
00E
009
007
004
001
000
000
UBR
HEX
299
14C
0A6
06E
052
036
029
01B
014
00D
006
003
001
UART0 and UART1 High Byte Baud-rate Register UBRRHI
The UART baud register is a 12-bit register. The 4 most significant bits are located in a sepa-
rate register, UBRRHI. Note that both UART0 and UART1 share this register. Bit 7 to bit 4 of
UBRRHI contain the 4 most significant bits of the UART1 baud register. Bit 3 to bit 0 contain
the 4 most significant bits of the UART0 baud register.
Bit
$20 ($40)
Read/Write
Initial Value
UBR
UBR
UBR
239
119
665
332
166
110
25
12
59
39
29
19
14
82
54
41
27
20
13
6
3
2
1
1
0
0
0
9
7
4
1
0
0
6
3
1
Actual
Freq
Actual
Freq
Actual
Freq
115200
288000
576000
576000
114179
228357
399625
799250
15625
20833
31250
31250
62500
62500
62500
14400
19200
28800
38400
57600
72000
14401
19259
29064
38060
57089
76119
2404
4808
8929
2400
4800
9600
2400
4800
9572
7
MSB1
R/W
0
Desired
Freq.
Desired
Freq.
Desired
Freq.
115200
115200
230400
460800
912600
115200
230400
460800
912600
14400
19200
28880
38400
57600
76800
14400
19200
28880
38400
57600
76800
14400
19200
28880
38400
57600
76800
2400
4800
9600
2400
4800
9600
2400
4800
9600
6
R/W
0
%
Error
%
Error
%
Error
22.9
22.9
84.3
20.0
20.0
58.4
15.3
14.2
0.2
0.2
7.5
7.8
7.8
7.6
7.8
0.0
0.0
0.0
0.0
0.0
0.3
0.0
0.0
6.7
0.0
0.0
0.0
0.3
0.0
0.3
0.6
0.9
0.9
0.9
0.9
0.9
Clock
MHz
Clock
MHz
Clock
MHz
1.8432 0000
18.432 0001
5
R/W
0
40 0100
UBRRHI
7:4 or 3:0
0000
0000
0000
0000
0000
0000
0000
0000
0000
UBRRHI
7:4 or 3:0
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
UBRRHI
7:4 or 3:0
0010
0001
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
4
LSB1
R/W
0
UBRRn
00101111
00010111
00001011
00000111
00000101
00000011
00000010
00000001
00000001
00000000
UBRRn
11011111
11101111
01110111
01001111
00111011
00100111
00011101
00010011
00001110
00001001
00000100
00000001
00000000
UBRRn
00010001
00001000
00000011
10101100
10000001
01010110
01000000
00101010
00100000
00010101
00001010
00000100
00000010
3
MSB0
R/W
0
AT94K Series FPSLIC
UBR
HEX
02F
017
00B
007
005
003
002
001
001
000
UBR
HEX
1DF
0EF
077
04F
03B
027
01D
013
00E
009
004
001
000
UBR
HEX
411
208
103
0AC
081
056
040
02A
020
015
00A
004
002
2
R/W
0
UBR
UBR
UBR
1041
479
239
119
520
259
172
129
47
23
11
79
59
39
29
19
14
86
64
42
32
21
10
7
5
3
2
1
1
0
9
4
1
0
4
2
Actual
Freq
Actual
Freq
Actual
Freq
1
R/W
0
1152000
115200
115200
230400
576000
113636
227273
500000
833333
14400
19200
28800
38400
57600
57600
14400
19200
28800
38400
57600
76800
14451
19231
28736
38462
58140
75758
2400
4800
9600
2400
4800
9600
2399
4798
9615
Desired
Freq.
Desired
Freq.
Desired
Freq.
0
LSB0
R/W
0
115200
115200
230400
460800
912600
115200
230400
460800
912600
14400
19200
28880
38400
57600
76800
14400
19200
28880
38400
57600
76800
14400
19200
28880
38400
57600
76800
2400
4800
9600
2400
4800
9600
2400
4800
9600
%
Error
%
Error
%
Error
33.3
20.0
20.8
0.0
0.0
0.0
0.0
0.0
0.3
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.3
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.2
0.4
0.2
0.5
0.2
0.9
1.4
1.4
1.4
7.8
9.5
UBRRHI
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