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MCP215X/40 Developer’s Daughter Board User’s Guide
D.1.1
The PICDEM? HPC Explorer Demo Board
The PICDEM HPC Explorer Demo Board firmware for these demos is available on the
Microchip web site, as well as on the AIPD Evaluation Board CD-ROM. The filename
is 00077 - HPC.asm . This code must be programmed into the PICDEM HPC Explorer
Demo Board’s PIC18F8722 for demo operation. This code supports three demos. The
demo executed is dependent on the state of the JP3:JP4 jumpers.
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. So for the PICDEM HPC Explorer Demo Board, the default crys-
tal is 10 MHz (does have a 4x PLL). Therefore, the 16XCLK frequency for 115200 baud
has an error outside usable limits for IrDA standard communication for both 10 MHz
and 40 MHz operation (see Table D-1). Table D-1 shows the SPBRG values for the
EUSART at different crystal frequencies.
TABLE D-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
225
129
-1.73%
129
64
-0.16%
-0.16%
95
47
0%
0%
64
32
-0.16%
1.36%
47
23
0%
0%
-0.16%
57600
42
21
1.36%
15
0%
10
1.36%
7
0%
-0.94%
115200
21
1.36%
10
1.36%
7
0%
4
-8.51%
3
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 46
Note:
The demo code ( 00077 - HPC.asm ) has been written for the PICDEM
HPC board with a 10 MHz crystal. There is also a version ( 00077 HPC
14MHz.asm ) that is for the PICDEM HPC using a 14.7592 MHz crystal.
This requires the PICDEM HPC crystal to be changed. This change allows
all MCP215X baud rates to be supported.
? 2006 Microchip Technology Inc.
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