ATmega16A, ATmega32A, ATmega164P, ATmega324P, ATmega644P, and ATmega1284P Comparison

More in the series of comparisons between similar yet functionally different AVR microcontrollers, this is a look at the ATmega16/ATmega32 vs the ATmega164 and it's variations.

Atmel considers the ATmega164 family to be upgrades to the ATmega16 family. They are pin compatible and source code compatible, unless you use a feature of the ATmega16/ATmega32 that has been expanded on the ATmega164 family. The register names are changed to accomodate the new features. An example is the USART, which has registers named like UDR in the ATmega16 and ATmega32, but UDR0, and UDR1 in the ATmega1284, ATmega644, ATmega324 and ATmega164.

ATmega 40-pin Device Feature Table

Device	ATmega16A	ATmega32A	ATmega164P	ATmega324P	ATmega644P	ATmega1284P
Flash	16384	32768	16384	32768	65536	131072
SRAM	1024	2048	1024	2048	4096	16384
EEPROM	512	1024	512	1024	2048	4096
PWM	4	4	6	6	6	6
Ext Interrupts	3	3	32	32	32	32
Max Freq	16	16	20	20	20	20
SPI	1	1	3	3	3	3
USART	1	1	2	2	2	2
picoPower	N	N	Y	Y	Y	Y
OC Chnls	4	4	6	6	6	6
VCC	2.7 to 5.5	2.7 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5
Price	$3.40	$4.48	$3.93	$5.03	$5.76	$5.82

Notes:

Prices are typical US $ per single unit as of April, 2012.

ATtiny 40-pin Device Pinouts

ATmega 40-pin (type A) Devices Pinout

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ATmega16A, ATmega32A, ATmega164P, ATmega324P, ATmega644P, and ATmega1284P Comparison

ATmega 40-pin Device Feature Table

ATtiny 40-pin Device Pinouts