Motorola MPC823e Reference Manual page 840

Communication Processor Module
• The parameter RAM values that pertain to the SMCx transmitter can only be written
when the TEN bit in the SMCMR is zero or after the STOP TRANSMIT command is
issued, but before the RESTART TRANSMIT command is issued.
• The parameter RAM values that pertain to the SMCx receiver can only be written when:
The REN bit in the SMCMR is zero.
The receiver is previously enabled after the ENTER HUNT MODE command is
issued.
The CLOSE RX BD command is issued before the REN bit is set.
Table 16-36. SMCx (UART and Transparent) Parameter RAM Memory Map
ADDRESS
SMCx Base + 00
SMCx Base + 02
SMCx Base + 04
SMCx Base + 05
SMCx Base + 06
SMCx Base + 08
SMCx Base + 0C
SMCx Base + 10
SMCx Base + 12
SMCx Base + 14
SMCx Base + 18
SMCx Base + 1C
SMCx Base + 20
SMCx Base + 22
SMCx Base + 24
SMCx Base + 28
SMCx Base + 36
NOTE: You are only responsible for initializing the items in bold.
SMCx Base = (IMMR & 0xFFFF0000) + 0x3E80 (SMC1) and 0x3F80 (SMC2).
16-386
NAME WIDTH
RBASE Half-Word
TBASE Half-Word
RFCR Byte
TFCR Byte
MRBLR Half-Word
RSTATE Word
RPTR Word
RBPTR Half-Word
RCNT Half-Word
RTMP Word
TSTATE Word
TPTR Word
TBPTR Half-Word
TCNT Half-Word
TTMP Word
MPC823e REFERENCE MANUAL
DESCRIPTION
RX Buffer Descriptor Base Address
TX Buffer Descriptor Base Address
RX Function Code
TX Function Code
Maximum Receive Buffer Length
RX Internal State
RX Internal Data Pointer
RX Buffer Descriptor Pointer
RX Internal Byte Count
RX Temp
TX Internal State
TX Internal Data Pointer
TX Buffer Descriptor Pointer
TX Internal Byte Count
TX Temp
First Word of Protocol-Specific Area
Last Word of Protocol-Specific Area
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