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ST68C554 bảng dữ liệu(PDF) 17 Page - Exar Corporation

tên linh kiện ST68C554
Giải thích chi tiết về linh kiện  QUAD UART WITH 16-BYTE FIFOS
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ST16C554/554D/68C554
17
Rev. 3.10
REGISTER FUNCTIONAL DESCRIPTIONS
The following table delineates the assigned bit functions for the fifteen 554D internal registers. The assigned
bit functions are more fully defined in the following paragraphs.
Table 6, ST16C554D INTERNAL REGISTERS
A2 A1 A0
Register
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
[Note *5]
General Register Set
0 0 0
RHR[XX]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
0 0 0
THR[XX]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
0 0 1
IER[00]
0000
modem
receive
transmit
receive
status
line
holding
holding
interrupt
status
register
register
interrupt
0 1 0
FCR
RCVR
RCVR
0
0
DMA
XMIT
RCVR
FIFO
trigger
trigger
mode
FIFO
FIFO
enable
(MSB)
(LSB)
select
reset
reset
0 1 0
ISR[01]
FIFO’s
FIFO’s
0
0
INT
INT
INT
INT
enabled
enabled
priority
priority
priority
status
bit-2
bit-1
bit-0
0 1 1
LCR[00]
divisor
set
set
even
parity
stop
word
word
latch
break
parity
parity
enable
bits
length
length
enable
bit-1
bit-0
1 0 0
MCR[00]
0
0
0
loop
-OP2/
-OP1
-RTS
-DTR
back
INTx
enable
1 0 1
LSR[60]
FIFO
trans.
trans.
break
framing
parity
overrun
receive
data
empty
holding
interrupt
error
error
error
data
error
empty
ready
1 1 0
MSR[X0]
CD
RI
DSR
CTS
delta
delta
delta
delta
-CD
-RI
-DSR
-CTS
1 1 1
SPR[FF]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
Special Register set: Note *2
0 0 0
DLL[XX]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
0 0 1
DLM[XX]
bit-15
bit-14
bit-13
bit-12
bit-11
bit-10
bit-9
bit-8
Note *2: The Special register set is accessible only when LCR bit-7 is set to “1”.



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