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參數(shù)資料
| 型號(hào)： | MP80C51T-20D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁(yè)數(shù)： | 85/170頁(yè) |
| 文件大小： | 4133K |
| 代理商： | MP80C51T-20D |
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21
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
6.5
Register Description
6.5.1
CLKMSR – Clock Main Settings Register
Bit 7:2 – Res: Reserved Bits
These bits are reserved and always read zero.
Bit 1:0 – CLKMS[1:0]: Clock Main Select Bits
These bits select the main clock source of the system. The bits can be written at run-time to switch the source of
the main clock. The clock system ensures glitch free switching of the main clock source.
The main clock alternatives are shown in Table 6-3.
To avoid unintentional switching of main clock source, a protected change sequence must be followed to change
the CLKMS bits, as follows:
1.
Write the signature for change enable of protected I/O register to register CCP
2.
Within four instruction cycles, write the CLKMS bits with the desired value
6.5.2
OSCCAL – Oscillator Calibration Register
.
Bits 7:0
– CAL[7:0]: Oscillator Calibration Value
The oscillator calibration register is used to trim the calibrated internal oscillator and remove process variations
from the oscillator frequency. A pre-programmed calibration value is automatically written to this register during
chip reset, giving the factory calibrated frequency as specified in Table 16-2, “Calibration Accuracy of Internal RC
The application software can write this register to change the oscillator frequency. The oscillator can be calibrated
to frequencies as specified in Table 16-2, “Calibration Accuracy of Internal RC Oscillator,” on page 117. Calibration
outside the range given is not guaranteed.
The CAL[7:0] bits are used to tune the frequency of the oscillator. A setting of 0x00 gives the lowest frequency, and
a setting of 0xFF gives the highest frequency.
Bit
765
432
1
0
–
CLKMS1
CLKMS0
CLKMSR
Read/Write
R
R/W
Initial Value
0
Table 6-3.
Selection of Main Clock
CLKM1
CLKM0
Main Clock Source
0
Calibrated Internal 8 MHzOscillator
0
1
Internal 128 kHz Oscillator (WDT Oscillator)
1
0
External clock
11
Reserved
Bit
765
432
1
0
CAL7
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSCCAL
Read/Write
R/W
Initial Value
X
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