ATMEGA103(1999) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA103
(Rev.:1999)

8-bit Microcontroller with 64K/128K Bytes In-System Programmable Flash

Atmel Corporation 

Comparison Between ATmega603 and ATmega103

The ATmega603 has 64K bytes of In-System Programmable Flash, 2K bytes of EEPROM, and 4K bytes of internal SRAM.

The ATmega603 does not have the ELPM instruction.

The ATmega103 has 128K bytes of In-System Programmable Flash, 4K bytes of EEPROM, and 4K bytes of internal

SRAM. The ATmega103 has the ELPM instruction, necessary to reach the upper half of the Flash memory for constant

table lookup.

Table 1 summarizes the different memory sizes for the two devices.

Table 1. Memory Size Summary

Part

Flash

ATmega603

64K bytes

ATmega103

128K bytes

EEPROM

2K bytes

4K bytes

SRAM

4K bytes

4K bytes

Pin Descriptions

VCC

Supply voltage

GND

Ground

Port A (PA7..PA0)

Port A is an 8-bit bi-directional I/O port. Port pins can provide internal pull-up resistors (selected for each bit). The Port A

output buffers can sink 20 mA and can drive LED displays directly. When pins PA0 to PA7 are used as inputs and are

externally pulled low, they will source current if the internal pull-up resistors are activated.

Port A serves as Multiplexed Address/Data bus when using external SRAM.

The port A pins are tri-stated when a reset condition becomes active, even if the clock is not running.

Port B (PB7..PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port B output buffers can sink 20 mA. As inputs,

Port B pins that are externally pulled low, will source current if the pull-up resistors are activated.

Port B also serves the functions of various special features.

The port B pins are tri-stated when a reset condition becomes active, even if the clock is not running.

Port C (PC7..PC0)

Port C is an 8-bit Output port. The Port C output buffers can sink 20 mA.

Port C also serves as Address output when using external SRAM.

Since Port C is an output only port, the port C pins are not tri-stated when a reset condition becomes active.

Port D (PD7..PD0)

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port D output buffers can sink 20 mA. As inputs,

Port D pins that are externally pulled low will source current if the pull-up resistors are activated.

Port D also serves the functions of various special features.

The port D pins are tri-stated when a reset condition becomes active, even if the clock is not running.

4

ATmega603/103

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