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Serial Communication Controllers (SCCs)
MC68360 USER’S MANUAL
7.10.16.4 UART MEMORY MAP. When configured to operate in UART mode, the QUICC
overlays the structure listed in Table 7-5 with the UART-specific parameters described in
Table 7-7.
NOTE: The boldface items should be initialized by the user.
MAX_IDL. Once a character is received on the line, the UART controller begins counting any
idle characters received. If a MAX_IDL number of idle characters is received before the next
data character is received, an idle timeout occurs, and the buffer is closed. This in turn can
produce an interrupt request to the CPU32+ core to receive the data from the buffer. Thus,
MAX_IDL provides a convenient way to demarcate frames in the UART mode. To disable
the MAX_IDL feature, simply program it to $0000. A character of idle is calculated as the
following number of bit times: 1 + data length (5, 6, 7, 8, or 9) + 1 (if parity bit is used) +
number of stop bits (1 or 2). Example: for 8 data bits, no parity, and 1 stop bit, the character
length is 10 bits.
Table 7-7. UART-Specific Parameters
Address
Name
Width
Description
SCC Base + 30
RES
Long
Reserved
SCC Base + 34
RES
Long
Reserved
SCC Base + 38
MAX_IDL
Word
Maximum idle Characters
SCC Base + 3A
IDLC
Word
Temporary idle Counter
SCC Base + 3C
BRKCR
Word
Break Count Register (Transmit)
SCC Base + 3E
PAREC
Word
Receive Parity Error Counter
SCC Base + 40
FRMEC
Word
Receive Framing Error Counter
SCC Base + 42
NOSEC
Word
Receive Noise Counter
SCC Base + 44
BRKEC
Word
Receive Break Condition Counter
SCC Base + 46
BRKLN
Word
Last Received Break Length
SCC Base + 48
UADDR1
Word
UART Address Character 1
SCC Base + 4A
UADDR2
Word
UART Address Character 2
SCC Base + 4C
RTEMP
Word
Temp Storage
SCC Base + 4E
TOSEQ
Word
Transmit Out-of-Sequence Character
SCC Base + 50
CHARACTER1
Word
CONTROL Character 1
SCC Base + 52
CHARACTER2
Word
CONTROL Character 2
SCC Base + 54
CHARACTER3
Word
CONTROL Character 3
SCC Base + 56
CHARACTER4
Word
CONTROL Character 4
SCC Base + 58
CHARACTER5
Word
CONTROL Character 5
SCC Base + 5A
CHARACTER6
Word
CONTROL Character 6
SCC Base + 5C
CHARACTER7
Word
CONTROL Character 7
SCC Base + 5E
CHARACTER8
Word
CONTROL Character 8
SCC Base + 60
RCCM
Word
Receive Control Character Mask
SCC Base + 62
RCCR
Word
Receive Control Character Register
SCC Base + 64
RLBC
Word
Receive Last Break Character
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