參數(shù)資料
型號: ST16C450CP40-F
廠商: Exar Corporation
文件頁數(shù): 4/28頁
文件大小: 0K
描述: IC INTERFACE UART
標準包裝: 9
系列: *
其它名稱: 1016-1760
ST16C450
12
Rev. 4.20
REGISTER FUNCTIONAL DESCRIPTIONS
The following table delineates the assigned bit functions for the twelve ST16C450 internal registers. The as-
signed bit functions are more fully defined in the following paragraphs.
Table 4, ST16C450 INTERNAL REGISTERS
A2 A1 A0
Register
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
[Default]
Note *5
General Register Set
0
RHR [XX]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
0
THR [XX]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
0
1
IER [00]
0000
modem
receive
transmit
receive
status
line
holding
interrupt
status
register
interrupt
0
1
0
ISR [01]
0000
INT
priority
status
bit-2
bit-1
bit-0
0
1
LCR [00]
divisor
set
even
parity
stop
word
latch
break
parity
enable
bits
length
enable
bit-1
bit-0
1
0
MCR [00]
0
loop
-OP2
-OP1
-RTS
-DTR
back
1
0
1
LSR [60]
0
trans.
break
framing
parity
overrun
receive
empty
holding
interrupt
error
data
empty
ready
1
0
MSR [X0]
CD
RI
DSR
CTS
delta
-CD
-RI
-DSR
-CTS
1
SPR [FF]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
Special Register Set: Note *3
0
DLL [XX]
bit-7
bit-6
bit-5
bit-4
bit-3
bit-2
bit-1
bit-0
0
1
DLM [XX]
bit-15
bit-14
bit-13
bit-12
bit-11
bit-10
bit-9
bit-8
Note *3: The Special register set is accessible only when LCR bit-7 is set to a logic 1.
Note *5: The value represents the register’s initialized HEX value. An “X” signifies a 4-bit un-initialized nibble.
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