ATmega48 datasheet(5/340 Pages) ATMEL

5 / 340 page

7530H–AVR–02/09

ATmega48/88/168 Automotive

2.3

Comparison Between ATmega48, ATmega88, and ATmega168

The ATmega48, ATmega88 and ATmega168 differ only in memory sizes, boot loader support,

and interrupt vector sizes. Table 2-2 summarizes the different memory and interrupt vector sizes

for the three devices.

ATmega88 and ATmega168 support a real Read-While-Write Self-Programming mechanism.

There is a separate Boot Loader Section, and the SPM instruction can only execute from there.

In ATmega48, there is no Read-While-Write support and no separate Boot Loader Section. The

SPM instruction can execute from the entire Flash.

2.4

Pin Descriptions

2.4.1

VCC

Digital supply voltage.

2.4.2

GND

Ground.

2.4.3

Port B (PB7..0) XTAL1/

XTAL2/TOSC1/TOSC2

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscil-

lator amplifier and input to the internal clock operating circuit.

Table 2-1.

Temperature Grade Identification for Automotive Products

Temperature

Identifier

Comments

-40 ; +85

Similar to Industrial Temperature Grade but with Automotive

Quality

-40 ; +105

Reduced Automotive Temperature Range

-40 ; +125

Full AutomotiveTemperature Range

Table 2-2.

Memory Size Summary

Device

Flash

EEPROM

RAM

Interrupt Vector Size

ATmega48

4K Bytes

256 Bytes

512 Bytes

1 instruction word/vector

ATmega88

8K Bytes

512 Bytes

1K Bytes

1 instruction word/vector

ATmega168

16K Bytes

512 Bytes

1K Bytes

2 instruction words/vector

ATmega48 Datasheet(PDF) 5 Page - ATMEL Corporation

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