MC72000 Freescale Semiconductor, MC72000 Datasheet - Page 59

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

RST
RST
W
W
R
R
FE—Frame/Stop Bit Error
PE—Parity Error
SE—Start Bit Error
7.2.5.3 UART Data Register (UDATA)
UDATA fills the UART transmit FIFO buffer with bytes that are to be transmitted, and to read the received
bytes from the UART receive FIFO buffer.
It is possible to read/write 1 byte per access.
RXDATA[7:0]—Received Byte
TXDATA[7:0]—Byte To Transmit
7.2.5.4 UART Buffer Control Registers
The UART buffers use threshold values to generate interrupts. These thresholds can be used to specify that
an interrupt should be generated before the transmit FIFO has become completely empty, or some time
MOTOROLA
This read-only bit indicates, while HIGH, that the current character had a framing error (missing stop
bit or break condition). The data is possibly corrupted. This bit is updated for each character read from
the FIFO. The FE bit is cleared by UART reset or by reading the USTAT register.
This read-only bit indicates, while HIGH, that the current character was detected with a parity error. The
data is possibly corrupted. This bit is updated for each character read from the FIFO. While parity is
disabled, this bit always reads zero. The PE bit is cleared by UART reset or by reading the USTAT
register.
This read-only bit indicates, while HIGH, that the current character had a framing error (missing start
bit.) The data is possibly corrupted. This can occur when a start bit (RXD = 0) is found, but is not
verified at the center of the bit (for example, glitch). This bit is updated for each character read from the
FIFO. The SE bit is cleared by UART reset or by reading the USTAT register.
This bit field contains the 8-bit data that has been received.
This bit field contains the 8-bit data to be transmitted.
31
15
0
0
0
0
1 = Framing error occurred
0 = No framing error
1 = Parity error occurred
0 = No parity error
1 = Start bit error occurred
0 = No start bit error
= writes have no effect and terminate without transfer error exception
30
14
0
0
0
0
29
13
0
0
0
0
28
12
0
0
0
0
Freescale Semiconductor, Inc.
For More Information On This Product,
MC72000 Advance Information Data Sheet
27
11
0
0
0
0
26
10
Go to: www.freescale.com
0
0
0
0
UDATABase + $008
25
0
0
9
0
0
Preliminary
24
0
0
8
0
0
23
0
0
7
22
0
0
6
Hardware Functional Description
21
0
0
5
20
Undefined
0
0
4
RXDATA
TXDATA
19
0
0
3
18
0
0
2
17
0
0
1
59
16
0
0
0