Datasheet

© 2007 Microchip Technology Inc. DS39599G-page 201
PIC18F2220/2320/4220/4320
TABLE 18-5: BAUD RATES FOR SYNCHRONOUS MODE (SYNC = 1)
BAUD
RATE
(K)
F
OSC = 40.000 MHz FOSC = 20.000 MHz FOSC = 16.000 MHz FOSC = 10.000 MHz
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate
(K)
%
Error
SPBRG
value
(decimal)
9.6 — — — — — — 15.63 62.76 255 9.77 1.73 255
19.2 — — — 19.53 1.73 255 19.23 0.16 207 19.23 0.16 129
38.4 39.06 1.73 255 38.46 0.16 129 38.46 0.16 103 38.46 0.16 64
57.6 57.47 -0.22 173 57.47 -0.22 86 57.97 0.64 68 58.14 0.94 42
76.8 76.92 0.16 129 76.92 0.16 64 76.92 0.16 51 75.76 -1.36 32
96.0 96.15 0.16 103 96.15 0.16 51 95.24 -0.79 41 96.15 0.16 25
250.0 250.00 0.00 39 250.00 0.00 19 250.00 0.00 15 250.00 0.00 9
300.0 303.03 1.01 32 294.12 -1.96 16 307.69 2.56 12 312.50 4.17 7
500.0 500.00 0.00 19 500.00 0.00 9 500.00 0.00 7 500.00 0.00 4
625.0 625.00 0.00 15 625.00 0.00 7 666.67 6.67 5 625.00 0.00 3
1000.0 1000.00 0.00 9 1000.00 0.00 4 1000.00 0.00 3 833.33 -16.67 2
1250.0 1250.00 0.00 7 1250.00 0.00 3 1333.33 6.67 2 1250.00 0.00 1
BAUD
RATE
(K)
F
OSC = 8.000000 MHz FOSC = 7.159090 MHz FOSC = 5.068800 MHz FOSC = 4.000 MHz
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
2.4 7.81 225.52 255 6.99 191.30 255 4.95 106.25 255 3.91 62.76 255
9.6 9.62 0.16 207 9.62 0.23 185 9.60 0.00 131 9.62 0.16 103
19.2 19.23 0.16 103 19.24 0.23 92 19.20 0.00 65 19.23 0.16 51
38.4 38.46 0.16 51 38.08 -0.83 46 38.40 0.00 32 38.46 0.16 25
57.6 57.14 -0.79 34 57.73 0.23 30 57.60 0.00 21 58.82 2.12 16
76.8 76.92 0.16 25 77.82 1.32 22 74.54 -2.94 16 76.92 0.16 12
96.0 95.24 -0.79 20 94.20 -1.88 18 97.48 1.54 12 100.00 4.17 9
250.0 250.00 0.00 7 255.68 2.27 6 253.44 1.38 4 250.00 0.00 3
300.0 285.71 -4.76 6 298.30 -0.57 5 316.80 5.60 3 333.33 11.11 2
500.0 500.00 0.00 3 447.44 -10.51 3 422.40 -15.52 2 500.00 0.00 1
625.0 666.67 6.67 2 596.59 -4.55 2 633.60 1.38 1 — — —
1000.0 1000.00 0.00 1 894.89 -10.51 1 — — — 1000.00 0.00 0
1250.0 — — — 1789.77 43.18 0 1267.20 1.38 0 — — —
BAUD
RATE
(K)
F
OSC = 3.579545 MHz FOSC = 2.000000 MHz FOSC = 1.000000 MHz FOSC = 0.032768 MHz
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
Actual
Rate (K)
%
Error
SPBRG
value
(decimal)
0.3 — — — — — — 0.98 225.52 255 0.30 1.14 26
1.2 — — — 1.95 62.76 255 1.20 0.16 207 1.17 -2.48 6
2.4 3.50 45.65 255 2.40 0.16 207 2.40 0.16 103 2.73 13.78 2
9.6 9.62 0.23 92 9.62 0.16 51 9.62 0.16 25 8.19 -14.67 0
19.2 19.04 -0.83 46 19.23 0.16 25 19,.23 0.16 12 — — —
38.4 38.91 1.32 22 38.46 0.16 12 35.71 -6.99 6 — — —
57.6 55.93 -2.90 15 55.56 -3.55 8 62.50 8.51 3 — — —
76.8 74.57 -2.90 11 71.43 -6.99 6 83.33 8.51 2 — — —
96.0 99.43 3.57 8 100.00 4.17 4 — — — — — —
250.0 223.72 -10.51 3 250.00 0.00 1 250.00 0.00 0 — — —
500.0 447.44 -10.51 1 500.00 0.00 0 — — — — — —