System Specification for C65 | Fred Bowen | March 1, 1991 |
The BAUD RATE can be generated using the following formulas:
URCLK URCLK BaudRate = ---------------- or, COUNT = --------------- 16 ( COUNT+1 ) 16 x BaudRate Where: COUNT = value loaded into BAUD RATE register URCLK = C7Mhz input, 7.15909 MHz NTSC 7.09375 MHz PAL
The following tables show some of the most common data rates. Data rate errors of less than +/-1.5% are acceptable for most purposes.
BR # | BAUD RATE REQUIRED | COUNT (HEX) | BAUD RATE OBTAINED | PERCENT ERROR | |
---|---|---|---|---|---|
1 | 50 | 22F4 | 49.999 | .0015 | |
2 | 75 | 174D | 74.999 | .0015 | |
3 | 110 | 0FE3 | 109.991 | .0080 | |
4 | 134.5 | 0CFE | 134.488 | .0090 | |
5 | 150 | 0BA6 | 149.998 | .0015 | |
6 | 300 | 05D2 | 299.895 | .035 | |
7 | 600 | 02E9 | 599.79 | .035 | |
8 | 1200 | 0174 | 1199.58 | .035 | |
9 | 1800 | 00F8 | 1796.96 | .17 | |
10 | 2400 | 00B9 | 2392.74 | .30 | |
11 | 3600 | 007B | 3608.41 | .23 | |
12 | 4800 | 005C | 4811.22 | .23 | |
13 | 7200 | 003D | 7216.82 | .23 | |
14 | 9600 | 002E | 9520.07 | .83 | |
15 | 19200 | 0016 | 19454.0 | 1.323 | |
16 | 31250 | 000D | 31960.2 | 1.023 | (MIDI) |
0 | 56000 | 0007 | 55930.4 | .124 |
BR # | BAUD RATE REQUIRED | COUNT (HEX) | BAUD RATE OBTAINED | PERCENT ERROR | |
---|---|---|---|---|---|
1 | 50 | 22A2 | 50.001 | .0020 | |
2 | 75 | 1716 | 75.005 | .0080 | |
3 | 110 | 0FBE | 109.987 | .010 | |
4 | 134.5 | OCDF | 134.514 | .010 | |
5 | 150 | OB8B | 149.986 | .009 | |
6 | 300 | 05C5 | 299.973 | .009 | |
7 | 600 | 02E2 | 599.75 | .009 | |
8 | 1200 | 0170 | 1198.27 | .144 | |
9 | 1800 | 00F5 | 1802.27 | .126 | |
10 | 2400 | 00B8 | 2396.54 | .144 | |
11 | 3600 | 007A | 3604.55 | .126 | |
12 | 4800 | 005B | 4819.12 | .398 | |
13 | 7200 | 003D | 7150.96 | .68 | |
14 | 9600 | 002D | 9638.25 | .40 | |
15 | 19200 | 0016 | 19276.5 | .40 | |
16 | 31250 | 000D | 31668.5 | 1.01 | (MIDI) |
0 | 56000 | 0007 | 55419.9 | 1.04 |
This page has been created by Sami Rautiainen. | |
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