MCP215X/40EV-DB Microchip Technology, MCP215X/40EV-DB Datasheet - Page 70

• Manufacturer Part Number: MCP215X/40EV-DB
• Description: BOARD DEMO FOR MCP215X/40
• Manufacturer: Microchip Technology

Specifications of MCP215X/40EV-DB

• Main Purpose: Interface, IrDA
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP2150, MCP2155, MCP2140
• Primary Attributes: PICDEM™ Demo Board Interface
• Processor To Be Evaluated: MCP21x
• Interface Type: UART
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

TABLE E-1:
DS51591A-page 66
9600
19200
57600
115200
Desired
Baud
Note 1:
Rate
2:
3:
SPBRG
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.
@ 40 MHz
225
129
42
21
SPBRG VALUES FOR EUSART
(3)
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.
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.
%Error SPBRG
-1.73%
-0.16%
-0.94%
1.36%
Note:
(2)
Other PICDEM Demo Boards may be used, but appropriate firmware needs
to be installed to demonstrate the system.
@ 20 MHz
129
64
21
10
(3)
%Error SPBRG
-0.16%
-0.16%
1.36%
1.36%
(2)
(1)
@ 14.7592 MHz
95
47
15
7
(3)
%Error SPBRG
0%
0%
0%
0%
(2)
@ 10 MHz
64
32
10
4
(3)
© 2006 Microchip Technology Inc.
%Error SPBRG
-0.16%
-8.51%
1.36%
1.36%
(2)
@ 7.3728 MHz
47
23
7
3
(3)
%Error
0%
0%
0%
0%
(2)