Rainbow-electronics ATmega64M1 Uživatelský manuál stáhnout pdf (Strana 33)

100

101

8209A–AVR–08/09

ATmega16M1/32M1/64M1

Figure 9-3. PCK Clocking System

9.7 128 kHz Internal Oscillator

The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-

quency is nominal at 3V and 25°C. This clock is used by the Watchdog Oscillator.

9.8 External Clock

To drive the device from an external clock source, XTAL1 should be driven as shown in Figure

9-4. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.

Figure 9-4. External Clock Drive Configuration

8 MHz

RC OSCILLATOR

OSCCAL

XTAL1

XTAL2

OSCILLATORS

DIVIDE

BY 8

DIVIDE

BY 2

PLL

64x

PLLE

Lock

Detector

PLOCK

SOURCE

PLLF

DIVIDE

BY 4

CLK

PLL

Table 9-8. External Clock Frequency

CKSEL3..0 Frequency Range

0000 0 - 16 MHz

XTAL2

XTAL1

GND

External

Clock

Signal

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 342 343

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