Signal Descriptions
MCF52110 ColdFire® Integrated Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
2-9
Preliminary
2.9
I
2
C I/O Signals
describes the I
2
C serial interface module signals.
2.10
UART Module Signals
describes the UART module signals.
2.11 DMA Timer Signals
describes the signals of the four DMA timer modules.
Table 2-8. I
2
C I/O Signals
Signal Name
Abbreviation
Function
I/O
Serial Clock
SCL
n
Open-drain clock signal for the for the I
2
C interface. It is driven by the
I
2
C module when the bus is in master mode or it becomes the clock
input when the I
2
C is in slave mode.
I/O
Serial Data
SDA
n
Open-drain signal that serves as the data input/output for the I
2
C
interface.
I/O
Table 2-9. UART Module Signals
Signal Name
Abbreviation
Function
I/O
Transmit Serial Data Output
UTXD
n
Transmitter serial data outputs for the UART modules. The output is
held high (mark condition) when the transmitter is disabled, idle, or in
the local loopback mode. Data is shifted out, LSB first, on this pin at
the falling edge of the serial clock source.
O
Receive Serial Data Input
URXD
n
Receiver serial data inputs for the UART modules. Data is received on
this pin LSB first. When the UART clock is stopped for power-down
mode, any transition on this pin restarts it.
I
Clear-to-Send
UCTS
n
Indicate to the UART modules that they can begin data transmission.
I
Request-to-Send
URTS
n
Automatic request-to-send outputs from the UART modules. This
signal can also be configured to be asserted and negated as a
function of the RxFIFO level.
O
Table 2-10. DMA Timer Signals
Signal Name
Abbreviation
Function
I/O
DMA Timer Input
DTIN
n
Event input to the DMA timer modules.
I
DMA Timer Output
DTOUT
n
Programmable output from the DMA timer modules.
O
