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參數(shù)資料
| 型號： | MR83C154XXX-12P883D |
| 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, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁數(shù)： | 67/81頁 |
| 文件大?。?/td> | 663K |
| 代理商： | MR83C154XXX-12P883D |
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7
ATtiny28L/V
1062F–AVR–07/06
System Clock and
Clock Options
The device has the following clock source options, selectable by Flash Fuse bits as
shown in Table 1.
Note:
“1” means unprogrammed, “0” means programmed.
The various choices for each clocking option give different start-up times as shown in
Internal RC Oscillator
The internal RC oscillator option is an on-chip calibrated oscillator running at a nominal
frequency of 1.2 MHz. If selected, the device can operate with no external components.
The device is shipped with this option selected.
Calibrated Internal RC
Oscillator
The calibrated internal oscillator provides a fixed 1.2 MHz (nominal) clock at 3V and
25
°C. This clock may be used as the system clock. This oscillator can be calibrated by
writing the calibration byte to the OSCCAL register. When this oscillator is used as the
chip clock, the Watchdog oscillator will still be used for the Watchdog Timer and for the
reset time-out. For details on how to use the pre-programmed calibration value, see the
section “Calibration Byte” on page 46.
Crystal Oscillator
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier, which
can be configured for use as an on-chip oscillator, as shown in Figure 5. Either a quartz
crystal or a ceramic resonator may be used. When the INTCAP fuse is programmed,
internal load capacitors with typical values 50 pF are connected between XTAL1/XTAL2
and ground.
Figure 5. Oscillator Connections
Note:
1. When using the MCU oscillator as a clock for an external device, an HC buffer should
be connected as indicated in the figure.
External Clock
To drive the device from an external clock source, XTAL2 should be left unconnected
while XTAL1 is driven as shown in Figure 6.
Table 1. Device Clocking Option Select
Clock Option
CKSEL3..0
External Crystal/Ceramic Resonator
1111 - 1010
External Low-frequency Crystal
1001 - 1000
External RC Oscillator
0111 - 0101
Internal RC Oscillator
0100 - 0010
External Clock
0001 - 0000
XTAL2
XTAL1
GND
C2
C1
MAX 1 HC BUFFER
HC
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