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參數(shù)資料
| 型號： | XRT16C854 |
| 廠商： | Exar Corporation |
| 英文描述： | 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO |
| 中文描述： | 2.97V至5.5V四路UART的128字節(jié)FIFO |
| 文件頁數(shù)： | 23/54頁 |
| 文件大小： | 485K |
| 代理商： | XRT16C854 |
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xr
REV. 3.0.1
XR16C854/854D
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
23
3.0
UART INTERNAL REGISTERS
Each UART channel in the 854 has its own set of configuration registers selected by address lines A0, A1 and
A2 with a specific channel selected (See
Table 1
and
Table 2
). The complete register set is shown on
Table 8
and
Table 9
.
T
ABLE
8: UART CHANNEL A AND B UART INTERNAL REGISTERS
A2,A1,A0 A
DDRESSES
R
EGISTER
R
EAD
/W
RITE
C
OMMENTS
16C550 C
OMPATIBLE
R
EGISTERS
0 0 0
RHR - Receive Holding Register
THR - Transmit Holding Register
Read-only
Write-only
LCR[7] = 0
0 0 0
DLL - Div Latch Low Byte
Read/Write
LCR[7] = 1, LCR
≠
0xBF
0 0 1
DLM - Div Latch High Byte
Read/Write
LCR[7] = 1, LCR
≠
0xBF
0 0 0
DREV - Device Revision Code
Read-only
DLL, DLM
=
0x00,
LCR[7] = 1, LCR
≠
0xBF
0 0 1
DVID - Device Identification Code
Read-only
DLL, DLM = 0x00,
LCR[7] = 1, LCR
≠
0xBF
0 0 1
IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0 1 0
ISR - Interrupt Status Register
FCR - FIFO Control Register
Read-only
Write-only
LCR[7] = 0
0 1 1
LCR - Line Control Register
Read/Write
1 0 0
MCR - Modem Control Register
Read/Write
LCR[7] = 0
1 0 1
LSR - Line Status Register
Reserved
Read-only
Write-only
LCR[7] = 0
1 1 0
MSR - Modem Status Register
Reserved
Read-only
Write-only
LCR[7] = 0
1 1 1
SPR - Scratch Pad Register
Read/Write
LCR[7] = 0, FCTR[6] = 0
1 1 1
FLVL - TX/RX FIFO Level Counter Register
Read-only
LCR[7] = 0, FCTR[6] = 1
1 1 1
EMSR - Enhanced Mode Select Register
Write-only
LCR[7] = 0, FCTR[6] = 1
E
NHANCED
R
EGISTERS
0 0 0
TRG - TX/RX FIFO Trigger Level Reg
FC - TX/RX FIFO Level Counter Register
Write-only
Read-only
LCR = 0xBF
0 0 1
FCTR - Feature Control Reg
Read/Write
LCR = 0xBF
0 1 0
EFR - Enhanced Function Reg
Read/Write
LCR = 0xBF
1 0 0
Xon-1 - Xon Character 1
Read/Write
LCR = 0xBF
1 0 1
Xon-2 - Xon Character 2
Read/Write
LCR = 0xBF
1 1 0
Xoff-1 - Xoff Character 1
Read/Write
LCR = 0xBF
1 1 1
Xoff-2 - Xoff Character 2
Read/Write
LCR = 0xBF
X X X
FSTAT - FIFO Status Register
Read-only
FSRS# pin is logic 0
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