MCP212XEV-DB Microchip Technology, MCP212XEV-DB Datasheet - Page 42

• Manufacturer Part Number: MCP212XEV-DB
• Description: BOARD DEMO FOR MCP212X
• Manufacturer: Microchip Technology

Specifications of MCP212XEV-DB

• Main Purpose: Interface, Infrared Transceiver
• Utilized Ic / Part: MCP2120, MCP2122
• Processor To Be Evaluated: MCP2122 and MCP2120
• Interface Type: UART
• Silicon Manufacturer: Microchip
• Silicon Core Number: MCP2120, MCP2122
• Kit Contents: MCP2122 Daughter Board, Docs
• Features: 8-Pin And 14-Pin Sockets, Three Optical Transceiver Circuits
• Mcu Supported Families: MCP212x
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TABLE E-1:
TABLE E-2:
DS51571B-page 38
9600
19200
38400
57600
115200
9600
19200
38400
57600
115200
Baud Rate
Desired
Note 1:
Note 1:
Baud Rate
Desired
2:
3:
2:
3:
Shaded values indicate a % error that is larger then 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).
CCP duty cycle should be approximately 50% of the PR value.
Shaded values indicate a % error that is larger then 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.
153,600
307,200
614,400
921,600
1,843,200
16XCLK
PR VALUES FOR PWM
SPBRG VALUES FOR EUSART
SPBRG
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 MCP2122). 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 communication for 20 MHz operation (see Table E-1). Therefore, the demo
will be limited to 9600 baud. Table E-2 shows the SPBRG values for the EUSART at
the same crystal frequencies.
225
129
64
42
21
@ 40 MHz
(3)
PR
64
32
15
10
@ 40 MHz
4
%Error
-1.73%
-0.16%
(3)
-0.16%
-0.94%
1.36%
(2)
%Error
-0.16%
-1.73%
-8.51%
1.36%
1.36%
(2)
(1)
SPBRG
129
64
32
21
10
@ 20 MHz
(3)
PR
(1)
32
15
@ 20 MHz
7
4
2
(3)
%Error
-0.16%
-0.16%
1.36%
1.36%
1.36%
(2)
%Error
-1.73%
-1.73%
-8.51%
-35.6%
1.36%
(2)
SPBRG
@ 14.759 MHz
95
47
23
15
7
@ 14.759 MHz
PR
23
11
(3)
5
3
1
(3)
%Error
0%
0%
0%
0%
0%
%Error
© 2006 Microchip Technology Inc.
(2)
0%
0%
0%
0%
0%
(2)
SPBRG
64
32
15
10
PR
4
@ 10 MHz
15
@ 10 MHz
7
3
2
1
(3)
(3)
%Error
-0.16%
-1.73%
-8.51%
%Error
32.18%
1.36%
1.36%
-1.73%
-1.73%
-1.73%
9.58%
(2)
(2)
®