参数资料
| 型号： | MCP2200T-I/MQ |
| 厂商： | Microchip Technology |
| 文件页数： | 25/34页 |
| 文件大小： | 0K |
| 描述： | IC USB 2.0 - UART 20QFN |
| 标准包装： | 3,300 |
| 特点： | USB 至 UART |
| 通道数： | 8 |
| FIFO's： | 256 字节 |
| 规程： | USB 2.0 |
| 电源电压： | 3 V ~ 5.5 V |
| 带自动流量控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VQFN 裸露焊盘 |
| 供应商设备封装： | 20-VQFN |
| 包装： | 带卷 (TR) |
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2009 Microchip Technology Inc.
DS41288F-page 31
PIC16F610/616/16HV610/616
3.4.1.1
OSCTUNE Register
The oscillator is factory calibrated but can be adjusted
in software by writing to the OSCTUNE register
The default value of the OSCTUNE register is ‘0’. The
value is a 5-bit two’s complement number.
When the OSCTUNE register is modified, the frequency
will begin shifting to the new frequency. Code execution
continues during this shift. There is no indication that the
shift has occurred.
TABLE 3-2:
SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
REGISTER 3-1:
OSCTUNE: OSCILLATOR TUNING REGISTER
U-0
R/W-0
—
TUN4
TUN3
TUN2
TUN1
TUN0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-5
Unimplemented: Read as ‘0’
bit 4-0
TUN<4:0>: Frequency Tuning bits
01111
= Maximum frequency
01110
=
00001
=
00000
= Oscillator module is running at the manufacturer calibrated frequency.
11111
=
10000
= Minimum frequency
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets(1)
CONFIG(2)
IOSCFS
CP
MCLRE
PWRTE
WDTE
FOSC2
FOSC1
FOSC0
—
OSCTUNE
—
TUN4
TUN3
TUN2
TUN1
TUN0
---0 0000
---u uuuu
Legend:
x
= unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.
Note
1:
Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
2:
See Configuration Word register (Register 12-1) for operation of all register bits.
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