
23
32117DS–AVR-01/12
AT32UC3C
NPCS[3:0]
SPI Peripheral Chip Select
I/O
Low
SCK
Clock
Output
Timer/Counter - TC0, TC1
A0
Channel 0 Line A
I/O
A1
Channel 1 Line A
I/O
A2
Channel 2 Line A
I/O
B0
Channel 0 Line B
I/O
B1
Channel 1 Line B
I/O
B2
Channel 2 Line B
I/O
CLK0
Channel 0 External Clock Input
Input
CLK1
Channel 1 External Clock Input
Input
CLK2
Channel 2 External Clock Input
Input
Two-wire Interface - TWIMS0, TWIMS1, TWIMS2
TWALM
SMBus SMBALERT
I/O
Low
Only on TWIMS0, TWIMS1
TWCK
Serial Clock
I/O
TWD
Serial Data
I/O
Universal Synchronous Asynchronous Receiver Transmitter - USART0, USART1, USART2, USART3, USART4
CLK
Clock
I/O
CTS
Clear To Send
Input
Low
DCD
Data Carrier Detect
Input
Low
Only USART1
DSR
Data Set Ready
Input
Low
Only USART1
DTR
Data Terminal Ready
Output
Low
Only USART1
RI
Ring Indicator
Input
Low
Only USART1
RTS
Request To Send
Output
Low
RXD
Receive Data
Input
TXD
Transmit Data
Output
Universal Serial Bus Device - USB
DM
USB Device Port Data -
Analog
Table 3-7.
Signal Description List
Signal Name
Function
Type
Active
Level
Comments