参数资料
| 型号： | MCP212XEV-DB |
| 厂商： | Microchip Technology |
| 文件页数： | 36/50页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP212X |
| 标准包装： | 1 |
| 主要目的： | 接口，红外线收发器 |
| 已用 IC / 零件： | MCP2120，MCP2122 |
| 已供物品： | 板 |
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MCP212X Developer’s Daughter Board User’s Guide
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? HPC Explorer Demo Board, the default crystal 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). The demo will be limited to 9600 baud. Table D-2 shows the SPBRG values
for the EUSART at the same crystal frequencies.
TABLE D-1:
PR VALUES FOR PWM (1)
Desired
Baud Rate
16XCLK
@ 40 MHz (2)
PR (3) %Error
@ 20 MHz (2)
PR (3) %Error
@ 14.759 MHz (2)
PR (3) %Error
@ 10 MHz (2)
PR (3) %Error
9600
19200
38400
57600
115200
153,600
307,200
614,400
921,600
1,843,200
64
32
15
10
4
-0.16%
1.36%
-1.73%
1.36%
-8.51%
32
15
7
4
2
1.36%
-1.73%
-1.73%
-8.51%
-35.6%
23
11
5
3
1
0%
0%
0%
0%
0%
15
7
3
2
1
-1.73%
-1.73%
-1.73%
9.58%
32.18%
Note 1:
2:
3:
TABLE D-2:
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).
CCP Duty Cycle should be approximately 50% of the PR value.
SPBRG VALUES FOR EUSART (1)
Desired
@ 40 MHz (2)
@ 20 MHz (2)
@ 14.759 MHz (2)
@ 10 MHz (2)
Baud Rate
9600
19200
38400
57600
115200
SPBRG (3)
225
129
64
42
21
%Error
-1.73%
-0.16%
-0.16%
-0.94%
1.36%
SPBRG (3)
129
64
32
21
10
%Error
-0.16%
-0.16%
1.36%
1.36%
1.36%
SPBRG (3)
95
47
23
15
7
%Error
0%
0%
0%
0%
0%
SPBRG (3)
64
32
15
10
4
%Error
-0.16%
1.36%
-1.73%
1.36%
-8.51%
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.
DS51571A-page 32
? 2005 Microchip Technology Inc.
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