atmega168 8 or 10 bit?

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

hi,

could you please explain me if the atmega168 used in Diecimila is 8 or 10 bit microcontroller?
I think I'm a bit confused cause the data sheet says

"8-bit
Microcontroller
with 8K Bytes
In-System
Programmable
Flash"

Also, does anyone know could tell me what is the sampling rate of the AD conversion in Diecimila?

thanks
warp

2

hi,

could you please explain me if the atmega168 used in Diecimila is 8 or 10 bit microcontroller?
I think I'm a bit confused cause the data sheet says

"8-bit
Microcontroller
with 8K Bytes
In-System
Programmable
Flash"

Also, does anyone know could tell me what is the sampling rate of the AD conversion in Diecimila?

thanks
warp

Eh? 8 bits is 8 bits. Are you somehow confusing addressing range with native data type size? Even the 1980's era 8-bit 6502 could address 64KB...

As for sampling rate, read this: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1208715493

3

I am a bit confused. i think that's obvious :slight_smile:

so let me put it differently:

if the atmega168 is 8-bit microcontroller, how can the Arduino's analog inputs be 10-bit resolution (0-1023) ?

does this make sense?? :-/

thanks for the sampling rate info

4

The ATMega chip holds the ADC the value in two 8 bit registers. The Arduino's analogRead function returns this as a single 16 bit integer with a maximum value of 1023.

5

right, ok... i think i got it (?)

thanks