
MOTOROLA
Chapter 30. Serial Management Controllers
30-15
Part V. The Communications Processor Module
Data length represents the number of octets the CP writes into the buffer. After data is
received in the buffer, the CP only writes the data length once as the BD closes. Note that
the memory allocated for this buffer should be no smaller than MRBLR. The Rx buffer
pointer points to the Þrst location of the buffer and must be even. The buffer can be in
internal or external memory. Figure 30-7 shows an example of how RxBDs are used in
receiving 10 characters, an idle period, and Þve characters (one with a framing error). The
example assumes that MRBLR = 8.
10
BR
Buffer closed on reception of break. Set when the buffer closes because a break sequence was
received. The CP writes BR after the received data is in the buffer.
11
FR
Framing error. Set when a character with a framing error is received and located in the last byte of this
buffer. A framing error is a character with no stop bit. A new receive buffer is used to receive additional
data. The CP writes FR after the received data is in the buffer.
12
PR
Parity error. Set when a character with a parity error is received in the last byte of the buffer. A new
buffer is used for additional data. The CP writes PR after received data is in the buffer.
13
Ñ
Reserved, should be cleared
14
OV
Overrun. Set when a receiver overrun occurs during reception. The CP writes OV after the received
data is in the buffer.
15
Ñ
Reserved, should be cleared
Table 30-8. SMC UART RxBD Status and Control Field Descriptions (Continued)
Bit
Name
Description
Содержание MPC860 PowerQUICC
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