MC72000 Freescale Semiconductor, MC72000 Datasheet - Page 57

• Manufacturer Part Number: MC72000
• Description: Integrated Bluetooth Radio
• Manufacturer: Freescale Semiconductor

ST2—Stop Bits
EP—Even Parity
PEN—Parity Enable
This active HIGH bit controls the parity generator in the transmitter and parity checker in the receiver. While
asserted, they are enabled. While negated, they are disabled.
RXE—RX Enable
TXE—TX Enable
7.2.5.2 UART Status Register (USTAT)
USTAT indicates interrupts and any errors that have been detected during transmission, such as FIFO buffer
overflow or underflow, parity error, and frame, start, or stop bit error.
MOTOROLA
This bit controls the number of stop bits transmitted after a character. While HIGH, two stop bits are
sent. While LOW, one stop bit is sent. This bit has no effect on the receiver which expects one or more
stop bits.
This bit controls the sense of the parity generator and checker. While LOW, odd parity is generated and
expected. While HIGH, even parity is generated and expected. This bit has no function if PEN is low.
This active HIGH bit enables the receiver. When the receiver is enabled, if the RXD line is already low,
the receiver does not recognize break characters, since it requires a valid one-to-zero transition before
it can accept any character. If disabled during a reception, the receiver will complete the current
reception then disable.
This active HIGH bit enables the transmitter. If disabled during a transmission, the UART will
immediately return TXD to idle (1). The transmitter FIFO cannot be written to when this bit is cleared.
1 = Set break
0 = No break
1 = Two stop bits
0 = One stop bit
1 = Even parity
0 = Odd parity
1 = Enable parity
0 = Disable parity
1 = Receiver enabled
0 = Receiver disabled
1 = Transmitter enabled
0 = Transmitter disabled
The SEL bit is used to select between using the RTS_2/RXD_2 and
RTS_1/RXD_1 ports on the UART module. In the MC72000, these ports
are connected to the GPIO ports B and C. RTS_2/RXD_2 are connected as
alternate functions to GPIO port B (GPIO_B11 and GPIO_B12) and are
called UART-RTS/UART-RXD. GPIO_B11 and GPIO_B12 must be set to
alternate function 2 mode in order to use RTS_2/RXD_2. RTS_1/RXD_1
are connected to pins RTS_/RXD on GPIO port C and no configuration is
necessary to use these pins.
Freescale Semiconductor, Inc.
For More Information On This Product,
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
Preliminary
NOTE:
Hardware Functional Description
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