capability to both receive and send information (such as memory). Transmitters and/or
receivers can operate in either master or slave mode, depending on whether the chip has
to initiate a data transfer or is only addressed. The I2C is a multi-master bus and can be
controlled by more than one bus master.
The I2C0-bus functions are fixed-pin functions. All other I2C-bus functions for I2C1/2/3
are movable functions and can be assigned through the switch matrix to any pin.
However, only the true open-drain pins provide the electrical characteristics to support the
full I2C-bus specification (see Ref. 3).
8.15.1 Features
• I2C0 supports Fast-mode Plus with data rates of up to 1 Mbit/s in addition to standard
and fast modes on two true open-drain pins.
• True open-drain pins provide fail-safe operation: When the power to an I2C-bus
device is switched off, the SDA and SCL pins connected to the I2C0-bus are floating
and do not disturb the bus.
• I2C1/2/3 support standard and fast mode with data rates of up to 400 kbit/s.
• Independent Master, Slave, and Monitor functions.
• Supports both Multi-master and Multi-master with Slave functions.
• Multiple I2C slave addresses supported in hardware.
• One slave address can be selectively qualified with a bit mask or an address range in
order to respond to multiple I2C bus addresses.
• 10-bit addressing supported with software assist.
• Supports SMBus.
8.16 SCTimer/PWM
The state configurable timer can perform basic 16-bit and 32-bit timer/counter functions
with match outputs and external and internal capture inputs. In addition, the
SCTimer/PWM can employ up to eight different programmable states, which can change
under the control of events, to provide complex timing patterns.
The inputs to the SCT are multiplexed between movable functions from the switch matrix
and internal connections such as the ADC threshold compare interrupt, the comparator
output, and the ARM core signals ARM_TXEV and DEBUG_HALTED. The signal on each
SCT input is selected through the INPUT MUX.
All outputs of the SCT are movable functions and are assigned to pins through the switch
matrix. One SCT output can also be selected as one of the ADC conversion triggers.
