27-22
MC9328MX1 Reference Manual
MOTOROLA
Universal Asynchronous Receiver/Transmitters (UART) Modules
27.7.1 UART Receiver Registers
The read-only UART Receiver Registers contain the received character and its status. After reset, when the
receiver enable bit is set (RXEN
=
1), these registers contain random data and the CHARRDY bit is 0 until
the first character is received. The URXDn_1 and URXDn_2 registers are each mapped to 16 word-length
addresses to support the LDM instruction.
URXDn_1
URXDn_2
UART1 Receiver Register n
UART2 Receiver Register n
Addr
0x04*n
0x04*n
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CHAR
RDY
ERR
OVR
RUN
FRM
ERR
BRK
PR
ERR
RX_DATA
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
?
?
?
?
?
?
?
?
0x0000
Note:
n
=
(0 through 15)
Table 27-12. UART1 Receiver Register n and UART2 Receiver Register n Description
Name
Description
Settings
Reserved
Bits 31–16
Reserved—These bits are reserved and should read 0.
CHARRDY
Bit 15
Character Ready
—Indicates an invalid read when the
RxFIFO is empty and the software attempts to read the
previously read data.
0 = The character in the RX_DATA
field and its associated flags
are invalid.
1 = The character in the RX_DATA
field and its associated flags
are valid and ready to read
ERR
Bit 14
Error Detect
—Indicates whether the character present in
the RX_DATA field has an error (OVRRUN, FRMERR,
BRK or PRERR) status. The ERR bit is updated and valid
for each received character.
0 = An error status was detected
1 = No error status was detected
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