LM3S6C11 Datasheet, PDF (622/828 Pages) Texas Instruments – Stellaris® LM3S6C11 Microcontroller

OBSOLETE: TI has discontinued production of this device.
Inter-Integrated Circuit (I²C) Interface
14.1 Block Diagram
Figure 14-1. I²C Block Diagram
Interrupt
I²C Control
I2CMSA
I2CMCS
I2CMDR
I2CMTPR
I2CMIMR
I2CMRIS
I2CMMIS
I2CMICR
I2CMCR
I2CSOAR
I2CSCSR
I2CSDR
I2CSIMR
I2CSRIS
I2CSMIS
I2CSICR
I²C Master Core
I2CSCL
I2CSDA
I²C Slave Core
I2CSCL
I2CSDA
I²C I/O Select
I2CSCL
I2CSDA
14.2
Signal Description
The following table lists the external signals of the I²C interface and describes the function of each.
The I²C interface signals are alternate functions for some GPIO signals and default to be GPIO
signals at reset., with the exception of the I2C0SCL and I2CSDA pins which default to the I²C
function. The column in the table below titled "Pin Mux/Pin Assignment" lists the possible GPIO pin
placements for the I²C signals. The AFSEL bit in the GPIO Alternate Function Select (GPIOAFSEL)
register (page 413) should be set to choose the I²C function. The number in parentheses is the
encoding that must be programmed into the PMCn field in the GPIO Port Control (GPIOPCTL)
register (page 430) to assign the I²C signal to the specified GPIO port pin. Note that the I²C pins
should be set to open drain using the GPIO Open Drain Select (GPIOODR) register. For more
information on configuring GPIOs, see “General-Purpose Input/Outputs (GPIOs)” on page 392.
Table 14-1. I2C Signals (100LQFP)
Pin Name
I2C0SCL
I2C0SDA
I2C1SCL
I2C1SDA
Pin Number Pin Mux / Pin
Assignment
70
PB2 (1)
71
PB3 (1)
19
PG0 (3)
26
PA0 (8)
34
PA6 (1)
18
PG1 (3)
27
PA1 (8)
35
PA7 (1)
Pin Type
I/O
I/O
I/O
I/O
Buffer Type^a Description
OD
I²C module 0 clock.
OD
I²C module 0 data.
OD
I²C module 1 clock.
OD
I²C module 1 data.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 14-2. I2C Signals (108BGA)
Pin Name
I2C0SCL
I2C0SDA
Pin Number Pin Mux / Pin
Assignment
C11
PB2 (1)
C12
PB3 (1)
Pin Type
I/O
I/O
Buffer Type^a Description
OD
I²C module 0 clock.
OD
I²C module 0 data.
622
July 24, 2012
Texas Instruments-Production Data