MC68340AB16E Datasheet, PDF (304/441 Pages) Motorola, Inc – Integrated Processor with DMA User’s Manual

Freescale Semiconductor, Inc.
CHANNEL A
COMMAND REGISTER (CRA)
EXTERNAL
INTERFACE
W
MODE REGISTER A (MR1A)
R/W
MODE REGISTER B (MR2A)
R/W
TRANSMIT
BUFFER (TBA)
(2 REGISTERS)
RECEIVE
BUFFER (RBA)
(4 REGISTERS)
STATUS REGISTER (SRA)
R
TRANSMIT HOLDING REGISTER
TRANSMIT SHIFT REGISTER
W
TxDA
RECEIVER HOLDING REGISTER 1
R
RECEIVER HOLDING REGISTER 2
RECEIVER HOLDING REGISTER 3
RECEIVER SHIFT REGISTER
FIFO
RxDA
CHANNEL B
COMMAND REGISTER (CRB)
W
MODE REGISTER 1 (MR1B)
R/W
MODE REGISTER 2 (MR2B)
R/W
TRANSMIT
BUFFER (TBB)
(2 REGISTERS)
STATUS REGISTER (SRB)
TRANSMIT HOLDING REGISTER
TRANSMIT SHIFT REGISTER
R
W
TxDB
RECEIVE
BUFFER (RBB)
(4 REGISTERS)
RECEIVER HOLDING REGISTER 1
R
RECEIVER HOLDING REGISTER 2
RECEIVER HOLDING REGISTER 3
RECEIVER SHIFT REGISTER
FIFO
RxDB
NOTE:
R/W = READ/WRITE
R = READ
W = WRITE ..... ..... .... . . .
Figure 7-4. Transmitter and Receiver Functional Diagram
MOTOROLA
MC68340 USER’S MANUAL
7-9
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