2 Peripheral Overview

Table 2-2. Peripheral Overview
Feature	CM3204-20	CM3204-28 CM6408-28 CM1216-28	CM3204-32 CM6408-32 CM1216-32	CM6408-48 CM1216-48	CM6408-64 CM1216-64
Pins	20	28	32	48	64
Max. frequency (MHz)	24	24	24	24	24
Generic Clock Controller (GCLK)	4	4	4	4	4
External High-Frequency Oscillator (XOSCHF)	0	0	0	0	0
External 32.768 kHz Oscillator	1	1	1	1	1
Timer/Counter (TC)	3	3	3	3	3
Timer/Counter for Control Applications (TCC)	1	1	1	1	1
Real-Time Counter (RTC)	1	1	1	1	1
Serial Communication Interface (SERCOM)	2	2	2	2	2
ADC (channels)	1 (11)	1 (16)	1 (20)	1 (25)	1 (29)
DAC	0	0	0	0	0
Analog Comparator (AC)	2	2	2	2	2
Peripheral Touch Controller (PTC) and (channels)	1 (11)	1 (16)	1 (20)	1 (25)	1 (29)
Operational Amplifier (OPAMP)	0	0	0	0	0
Configurable Custom Logic Look-up Table (CCL LUT)	3	4	4	4	4
Watchdog Timer (WDT)	1	1	1	1	1
Direct Memory Access Channels (DMA)	2	2	2	2	2
Event System channels (EVSYS)	4	4	4	4	4
General Purpose I/O⁽¹⁾	17/16	23/22	27/26	42/41	56/55
Multi-Voltage I/O (MVIO)	3	4	4	8	8
External Interrupts	11	13	15	16	16

Note: