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MCP215X/40 Developer’s Daughter Board User’s Guide
The firmware for these demos is available on the Microchip web site, as well as on the
AIPD Evaluation Board CD-ROM. The file name is 00077 - FS USB.asm . This code
must be programmed into the PICDEM FS USB Demo Board’s PIC18F4550 for demo
operation. This code requires the JP3 and JP4 jumpers to be in the documented state
to select program mode operation.
Note:
Other PICDEM Demo Boards may be used, but appropriate firmware needs
to be installed to demonstrate the system.
The crystal frequency of the PICDEM Demo Board determines the error rates for the
EUSART baud rates, as well as the 16XCLK generation (for the MCP2150). So, for the
PICDEM FS USB Demo Board, the default crystal is 20 MHz. The 16XCLK frequency
for 115200 and 57600 baud has an error outside usable limits for IrDA standard com-
munication for 20 MHz operation (see Table E-1). Table E-1 shows the SPBRG values
for the EUSART at the same crystal frequencies.
TABLE E-1:
SPBRG VALUES FOR EUSART (1)
Desired
@ 40 MHz (2)
@ 20 MHz (2)
@ 14.7592 MHz (2)
@ 10 MHz (2)
@ 7.3728 MHz (2)
Baud
Rate
SPBRG (3) %Error SPBRG (3) %Error SPBRG (3) %Error SPBRG (3) %Error SPBRG (3) %Error
9600
19200
57600
115200
225
129
42
21
-1.73%
-0.16%
-0.94%
1.36%
129
64
21
10
-0.16%
-0.16%
1.36%
1.36%
95
47
15
7
0%
0%
0%
0%
64
32
10
4
-0.16%
1.36%
1.36%
-8.51%
47
23
7
3
0%
0%
0%
0%
Note 1:
2:
3:
Shaded values indicate a % error that is larger than should be used.
The following shows the PICDEM? Demo Board device frequencies:
PICDEM? HPC Explorer Demo Board has a 10 MHz crystal installed (4xPLL -> 40 MHz).
PICDEM? FS USB Demo Board has a 20 MHz crystal installed.
PICDEM? 2 Plus Demo Board has a 4 MHz crystal installed.
PICDEM? LCD has a socket for an external canned oscillator (also has an internal 8 MHz RC).
SYNC = 0, BRGH = 1, BRG16 = 0.
DS51591A-page 66
? 2006 Microchip Technology Inc.
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