Datasheet

© 2007 Microchip Technology Inc. DS39599G-page 199
PIC18F2220/2320/4220/4320
TABLE 18-3: BAUD RATES FOR ASYNCHRONOUS MODE (BRGH = 0, LOW SPEED)
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)
0.3 — — — — — — 0.98 225.52 255 0.61 103.45 255
1.2 — — — 1.22 1.73 255 1.20 0.16 207 1.20 0.16 129
2.4 2.44 1.73 255 2.40 0.16 129 2.40 0.16 103 2.40 0.16 64
9.6 9.62 0.16 64 9.47 -1.36 32 9.62 0.16 25 9.77 1.73 15
19.2 18.94 -1.36 32 19.53 1.73 15 19.23 0.16 12 19.53 1.73 7
38.4 39.06 1.73 15 39.06 1.73 7 35.71 -6.99 6 39.06 1.73 3
57.6 56.82 -1.36 10 62.50 8.51 4 62.50 8.51 3 52.08 -9.58 2
76.8 78.13 1.73 7 78.13 1.73 3 83.33 8.51 2 78.13 1.73 1
96.0 89.29 -6.99 6 104.17 8.51 2 — — — — — —
115.2 125.00 8.51 4 — — — 125.00 8.51 1 78.13 -32.18 1
250.0 208.33 -16.67 2 — — 250.00 0.00 0 — — —
300.0 312.50 4.17 1 312.50 4.17 0 — — — — — —
625.0 625.00 0.00 0 — — — — — — — — —
BAUD
RATE
(K)
F
OSC = 8.000000 MHz FOSC = 7.159090 MHz FOSC = 5.068800 MHz FOSC = 4.000000 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 0.49 62.76 255 0.44 45.65 255 0.31 3.13 255 0.30 0.16 207
1.2 1.20 0.16 103 1.20 0.23 92 1.20 0.00 65 1.20 0.16 51
2.4 2.40 0.16 51 2.38 -0.83 46 2.40 0.00 32 2.40 0.16 25
9.6 9.62 0.16 12 9.32 -2.90 11 9.90 3.13 7 8.93 -6.99 6
19.2 17.86 -6.99 6 18.64 -2.90 5 19.80 3.13 3 20.83 8.51 2
38.4 41.67 8.51 2 37.29 -2.90 2 39.60 3.13 1 31.25 -18.62 1
57.6 62.50 8.51 1 55.93 -2.90 1 — — — 62.50 8.51 0
— — — — — — — 79.20 3.13 0 — — —
115.2 125.00 8.51 0 111.86 -2.90 0 — — — — — —
BAUD
RATE
(K)
FOSC = 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 0.30 0.23 185 0.30 0.16 103 0.30 0.16 51 0.26 -14.67 1
1.2 1.19 -0.83 46 1.20 0.16 25 1.20 0.16 12 — — —
2.4 2.43 1.32 22 2.40 0.16 12 2.23 -6.99 6 — — —
9.6 9.32 -2.90 5 10.42 8.51 2 7.81 -18.62 1 — — —
19.2 18.64 -2.90 2 15.63 -18.62 1 15.63 -18.62 0 — — —
38.4 — — — 31.25 -18.62 0 — — — — — —
57.6 55.93 -2.90 0 — — — — — — — — —