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參數(shù)資料
| 型號(hào)： | XRT16L2552 |
| 廠(chǎng)商： | Exar Corporation |
| 英文描述： | 2.25V TO 5.5V DUART WITH 16-BYTE FIFO |
| 中文描述： | 2.25V至5.5V的杜阿爾特16字節(jié)FIFO |
| 文件頁(yè)數(shù)： | 21/47頁(yè) |
| 文件大?。?/td> | 413K |
| 代理商： | XRT16L2552 |
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xr
REV. 1.1.1
XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
21
3.0
UART INTERNAL REGISTERS
Each of the UART channel in the L2552 has its own set of configuration registers selected by address lines A0,
A1 and A2 with CS# and CHSEL selecting the channel. The registers are 16C550 compatible. The complete
register set is shown in
Table 7
and
Table 8
.
T
ABLE
7: 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
0 1 0
AFR - Alternate Function Register
Read/Write
0 0 0
DREV - Device Revision
Read/Write
LCR[7] = 1, LCR
≠
0xBF,
DLL = 0x00, DLM = 0x00
0 0 1
DVID - Device ID
Read/Write
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
0 1 1
LCR - Line Control Register
Read/Write
1 0 0
MCR - Modem Control Register
Read/Write
LCR
≠
0xBF
1 0 1
LSR - Line Status Register
Reserved
Read-only
Write-only
1 1 0
MSR - Modem Status Register
Reserved
Read-only
Write-only
1 1 1
SPR - Scratch Pad Register
Read/Write
E
NHANCED
R
EGISTERS
0 1 0
EFR - Enhanced Function Register
Read/Write
LCR = 0xBF
1 0 0
Xon-1 - Xon Character 1
Read/Write
1 0 1
Xon-2 - Xon Character 2
Read/Write
1 1 0
Xoff-1 - Xoff Character 1
Read/Write
1 1 1
Xoff-2 - Xoff Character 2
Read/Write
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