SAM3U Datasheet, PDF (8/59 Pages) ATMEL Corporation – AT91SAM ARM-based Flash MCU

Table 3-1. Signal Description List (Continued)
Signal Name
Function
Type
Active
Level
Two-Wire Interface - TWI
TWDx
TWIx Two-wire Serial Data
I/O
TWCKx
TWIx Two-wire Serial Clock
I/O
12-bit Analog-to-Digital Converter - ADC12B
AD12Bx
Analog Inputs
Analog
AD12BTRG
ADC Trigger
Input
AD12BVREF
ADC Reference
Analog
10-bit Analog-to-Digital Converter - ADC
ADx
Analog Inputs
Analog
ADTRG
ADC Trigger
Input
ADVREF
ADC Reference
Analog
Fast Flash Programming Interface - FFPI
PGMEN0-PGMEN2 Programming Enabling
Input
PGMM0-PGMM3 Programming Mode
Input
PGMD0-PGMD15 Programming Data
I/O
PGMRDY
Programming Ready
Output
High
PGMNVALID
Data Direction
Output
Low
PGMNOE
Programming Read
Input
Low
PGMCK
Programming Clock
Input
PGMNCMD
Programming Command
Input
Low
USB High Speed Device - UDPHS
DFSDM
USB Device Full Speed Data -
Analog
DFSDP
USB Device Full Speed Data +
Analog
DHSDM
USB Device High Speed Data -
Analog
DHSDP
USB Device High Speed Data +
Analog
Voltage
Reference Comments
VDDIO
VDDUTMII
Notes:
1. PIOA: Schmitt Trigger on all except PA14 on 100 and 144 packages.
2. PIOB: Schmitt Trigger on all except PB9 to PB16, PB25 to PB31 on 100 and 144 packages.
3. PIOC: Schmitt Trigger on all except PC20 to PC27 on 144 package.
4. TDO pin is set in input mode when the Cortex-M3 Core is not in debug mode. Thus an external pull-up (100 kΩ) must be
added to avoid current consumption due to floating input.
3.1 Design Considerations
In order to facilitate schematic capture when using a SAM3U design, Atmel provides a “Sche-
matics Checklist” Application note.
Please visit http://www.atmel.com/products/AT91/ for additional documentation.
8 SAM3U Series
6430ES–ATARM–22-Aug-11