AT90S1200 Ver la hoja de datos (PDF) - Atmel Corporation

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Fabricante

AT90S1200

8-Bit Microcontroller with 1K bytes In-System Programmable Flash

Atmel Corporation 

Figure 2. Oscillator Connections

MAX 1 HC BUFFER

HC

C2

XTAL2

C1

XTAL1

GND

Note: When using the MCU Oscillator as a clock for an external device, an HC buffer should be

connected as indicated in the figure.

Figure 3. External Clock Drive Configuration

On-chip RC Oscillator

An On-chip RC Oscillator running at a fixed frequency of 1 MHz can be selected as the

MCU clock source. If enabled, the AT90S1200 can operate with no external compo-

nents. A control bit (RCEN) in the Flash Memory selects the On-chip RC Oscillator as

the clock source when programmed (“0”). The AT90S1200 is normally shipped with this

bit unprogrammed (“1”). Parts with this bit programmed can be ordered as

AT90S1200A. The RCEN-bit can be changed by parallel programming only. When

using the On-chip RC Oscillator for Serial Program downloading, the RCEN bit must be

programmed in Parallel Programming mode first.

4 AT90S1200

0838H–AVR–03/02

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