SDA6000 Datasheet, PDF (213/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Peripherals
below lists various commonly used baud rates, together with the required reload values
and the deviation errors compared to the intended baud rate.
Baud Rate
1041.66 KBaud
694.4 KBaud
19.2 KBaud
9600 Baud
4800 Baud
2400 Baud
1200 Baud
110 Baud
S0BRS = ‘0’, f_MOD = 33.33 MHz
Deviation Error Reload Value
–
0000_H
–
–
+ 0.4%/– 1.3%
+ 0.4%/– 0.4%
+ 0.0%/– 0.4%
+ 0.0%/– 0.2%
+ 0.0%/– 0.1%
+ 0.0%/– 0.0%
0035_H/0036_H
006b_H/006C_H
00D8_H/00D9_H
01B1_H/01B2_H
0363_H/0364_H
24FC_H/24FD_H
S0BRS = ‘1’, f_MOD = 33.33 MHz
Deviation Error Reload Value
–
–
–
+ 0.5%/– 2.2%
+ 0.5%/– 0.9%
+ 0.5%/– 0.2%
+ 0.1%/– 0.2%
+ 0.1%/– 0.0%
+ 0.0%/– 0.0%
0000_H
0023_H/0024_H
0047_H/0048_H
008F_H/0090_H
0120_H/0121_H
0241_H/0242_H
18A8_H/18A9_H
Note: S0FDE must be equal to 0 to achieve the baud rates in the table above. The
deviation errors given in the table are rounded. Using a baud rate crystal will
provide correct baud rates without deviation errors.
Using the Fractional Divider
When the fractional divider is selected, the input clock f_DIV for the baud rate timer is
derived from the CPU clock by a programmable divider. If S0FDE = 1, the fractional
divider is activated, It divides 33.33 MHz by a fraction of n/512 for any value of n from 0
to 511. If n = 0, the divider ratio is 1 which means that f_DIV = 33.33 MHz.
S0FDE S0BRS S0BG S0FDV
1
–
1 … 8191 1 … 511
0
Formula
Baud rate =
S0FDV
512
33MHz
x _{16 x (S0BG+1)}
33MHz
Baud rate = _{16 x (S0BG+1)}
S0BG represents the content of the reload register S0BG, taken as an unsigned 13-bit
integer.
S0FDV represents the content of the fractional divider register taken as an unsigned
9-bit integer.
Users Manual
7 - 62
2000-06-15