2 Peripheral Overview

Table 2-2. Peripheral Overview
Feature	AVR16EA28 AVR32EA28 AVR64EA28	AVR16EA32 AVR32EA32 AVR64EA32	AVR16EA48 AVR32EA48 AVR64EA48
Pins	28	32	48
Max. frequency (MHz)	20	20	20
16-bit Timer/Counter type A (TCA)	2	2	2
16-bit Timer/Counter type B (TCB)	4	4	4
Real-Time Counter (RTC)	1	1	1
USART/SPI host	3	3	3
SPI host/client	1	1	1
TWI/I²C	1⁽¹⁾	1⁽¹⁾	1⁽¹⁾
12-bit differential ADC (channels)	1 (24)	1 (28)	1 (32)
10-bit DAC	1	1	1
Analog Comparator (AC)	2	2	2
Configurable Custom Logic Look-up Table (CCL LUT)	4	4	4
Watchdog Timer	1	1	1
Event System channels	6	6	6
General Purpose I/O pins (input/output⁽²⁾)	24/23	28/27	42/41
PORT	PA[7:0] PC[3:0] PD[7:0] PF[7,6,1,0]	PA[7:0] PC[3:0] PD[7:0] PF[7:0]	PA[7:0] PB[5:0] PC[7:0] PD[7:0] PE[3:0] PF[7:0]
External interrupts	24	28	42
CRCSCAN	1	1	1
Unified Program and Debug Interface (UPDI)	1	1	1

Note:

AVR® EA