ATMEGA103L-4AC datasheet(6/141 Pages) ATMEL

Part #	ATMEGA103L-4AC

Description	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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6

ATmega103(L)

0945I–AVR–02/07

TOSC1

Input to the inverting Timer/Counter Oscillator amplifier.

TOSC2

Output from the inverting Timer/Counter Oscillator amplifier.

WR

External SRAM write strobe

RD

External SRAM read strobe

ALE

ALE is the Address Latch Enable used when the External Memory is enabled. The ALE

strobe is used to latch the low-order address (8 bits) into an address latch during the first

access cycle, and the AD0 - 7 pins are used for data during the second access cycle.

AVCC

Supply voltage for Port F, including ADC. The pin must be connected to VCC when not

used for the ADC. See “ADC Noise Canceling Techniques” on page 82 for details when

using the ADC.

AREF

AREF is the analog reference input for the ADC converter. For ADC operations, a volt-

age in the range AGND to AVCC must be applied to this pin.

AGND

If the board has a separate analog ground plane, this pin should be connected to this

ground plane. Otherwise, connect to GND.

PEN

PEN is a programming enable pin for the Serial Programming mode. By holding this pin

low during a Power-on Reset, the device will enter the Serial Programming mode. PEN

has no function during normal operation.

Clock Options

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 2. Either a quartz

crystal or a ceramic resonator may be used.

Figure 2. Oscillator Connections

Note:

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

connected as indicated in the figure.

XTAL2

XTAL1

GND

C2

C1

MAX 1 HC BUFFER

HC

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ATMEGA103L-4AC Datasheet(PDF) 6 Page - ATMEL Corporation

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