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參數(shù)資料
| 型號(hào)： | MD83C154DXXX-12/883D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | 0.600 INCH, CERAMIC, DIP-40 |
| 文件頁(yè)數(shù)： | 169/242頁(yè) |
| 文件大小： | 3080K |
| 代理商： | MD83C154DXXX-12/883D |
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32
2588F–AVR–06/2013
ATtiny261/461/861
From the time the CLKPS values are written, it takes between T1 + T2 and T1 + 2*T2 before the
new clock frequency is active. In this interval, two active clock edges are produced. Here, T1 is
the previous clock period, and T2 is the period corresponding to the new prescaler setting.
6.4
Clock Output Buffer
The device can output the system clock on the CLKO pin (when not used as XTAL2 pin). To
enable the output, the CKOUT Fuse has to be programmed. This mode is suitable when the chip
clock is used to drive other circuits on the system. Note that the clock will not be output during
reset and the normal operation of I/O pin will be overridden when the fuse is programmed. Inter-
nal RC Oscillator, WDT Oscillator, PLL, and external clock (CLKI) can be selected when the
clock is output on CLKO. Crystal oscillators (XTAL1, XTAL2) can not be used for clock output on
CLKO. If the System Clock Prescaler is used, it is the divided system clock that is output.
6.5
Register Description
6.5.1
OSCCAL – Oscillator Calibration Register
Bits 7:0 – CAL7:0: Oscillator Calibration Value
The Oscillator Calibration Register is used to trim the Calibrated Internal RC Oscillator to
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 19-2 on page 189. The application software can write this register to change
the oscillator frequency. The oscillator can be calibrated to frequencies as specified in Table 19-
2 on page 189. Calibration outside that range is not guaranteed.
Note that this oscillator is used to time EEPROM and Flash write accesses, and these write
times will be affected accordingly. If the EEPROM or Flash are written, do not calibrate to more
than 8.8 MHz. Otherwise, the EEPROM or Flash write may fail.
The CAL7 bit determines the range of operation for the oscillator. Setting this bit to 0 gives the
lowest frequency range, setting this bit to 1 gives the highest frequency range. The two fre-
quency ranges are overlapping, in other words a setting of OSCCAL = 0x7F gives a higher
frequency than OSCCAL = 0x80.
The CAL6:0 bits are used to tune the frequency within the selected range. A setting of 0x00
gives the lowest frequency in that range, and a setting of 0x7F gives the highest frequency in the
range.
6.5.2
CLKPR – Clock Prescale Register
Bit 7 – CLKPCE: Clock Prescaler Change Enable
The CLKPCE bit must be written to logic one to enable change of the CLKPS bits. The CLKPCE
bit is only updated when the other bits in CLKPR are simultaniosly written to zero. CLKPCE is
Bit
7654
3
2
10
CAL7
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSCCAL
Read/Write
R/W
Initial Value
Device Specific Calibration Value
Bit
7
6
5
4
3
210
CLKPCE
–
CLKPS3
CLKPS2
CLKPS1
CLKPS0
CLKPR
Read/Write
R/W
R
R/W
Initial Value
0
See Bit Description
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MR83C154DCXXX-16/883 | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| MQ83C154DXXX-12P883 | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44 |
| MD83C154DCXXX-25/883 | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40 |
| MR83C154DTXXX-25/883R | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| MQ83C154DTXXX-12P883 | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MD83C154-L16 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MD83C154T-12 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MD83C154T-16 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MD83C154T-20 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MD83C154T-25 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
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