at32uc3b0512-z2ues ATMEL Corporation, at32uc3b0512-z2ues Datasheet - Page 222

• Manufacturer Part Number: at32uc3b0512-z2ues
• Description: 32-bit Avr Microcontroller
• Manufacturer: ATMEL Corporation

19.5
Figure 19-2. Application Block Diagram
19.6
Table 19-3.
19.7
19.7.1
19.7.2
32059J–12/2010
Pin Name
TWD
TWCK
Application Block Diagram
I/O Lines Description
Product Dependencies
I/O Lines
Power Management
I/O Lines Description
Rp: Pull up value as given by the I²C Standard
Host with
Interface
TWI
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 GPIO lines. To enable the TWI, the programmer
must perform the following steps:
• Program the GPIO controller to:
The TWI clock is generated by the Power Manager (PM). Before using the TWI, the programmer
must ensure that the TWI clock is enabled in the PM.
In the TWI description, Master Clock (MCK) is the clock of the peripheral bus to which the TWI is
connected.
TWD
TWCK
– Dedicate TWD and TWCK as peripheral lines.
– Define TWD and TWCK as open-drain.
Serial EEPROM
Pin Description
Two-wire Serial Data
Two-wire Serial Clock
Atmel TWI
Slave 1
I²C RTC
Slave 2
Figure 19-2 on page
Controller
I²C LCD
Slave 3
I²C Temp.
222). When the bus is free, both lines are
Slave 4
Sensor
Rp
Rp
AT32UC3B
VDD
Input/Output
Input/Output
Type
222