at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 484

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

32.3
Figure 32-2. Application Block Diagram
32.3.1
32.4
32.4.1
32.4.2
32.4.3
484
Application Block Diagram
Product Dependencies
AT91SAM9263 Preliminary
I/O Lines Description
I/O Lines
Power Management
Interrupt
Rp: Pull up value as given by the I²C Standard
Host with
Interface
TWI
Table 32-2.
Both TWD and TWCK are bidirectional lines, connected to a positive supply voltage via a current
source or pull-up resistor (see
high. The output stages of devices connected to the bus must have an open-drain or open-col-
lector to perform the wired-AND function.
TWD and TWCK pins may be multiplexed with PIO lines. To enable the TWI, the programmer
must perform the following steps:
The TWI interface may be clocked through the Power Management Controller (PMC), thus the
programmer must first configure the PMC to enable the TWI clock.
The TWI interface has an interrupt line connected to the Advanced Interrupt Controller (AIC). In
order to handle interrupts, the AIC must be programmed before configuring the TWI.
TWD
TWCK
Pin Name
TWD
TWCK
• Program the PIO controller to:
• Enable the peripheral clock.
Serial EEPROM
– Dedicate TWD and TWCK as peripheral lines.
– Define TWD and TWCK as open-drain.
Atmel TWI
Slave 1
I/O Lines Description
I²C RTC
Slave 2
Pin Description
Two-wire Serial Data
Two-wire Serial Clock
Figure 32-2 on page
Controller
I²C LCD
Slave 3
I²C Temp.
484). When the bus is free, both lines are
Slave 4
Sensor
Rp
Rp
VDD
6249D–ATARM–20-Dec-07
Input/Output
Input/Output
Type