參數(shù)資料
型號： XR19L212IL48-0B-EB
廠商： Exar Corporation
文件頁數(shù)： 15/52頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR19L202 48QFN
標準包裝： 1
系列： *
XR19L212
22
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
REV. 1.0.1
3.0
UART INTERNAL REGISTERS
The L212 has a set of configuration registers selected by address lines A0, A1 and A2 with CS# asserted. The
complete register set is shown on Table 7 and Table 8.
TABLE 7: UART INTERNAL REGISTERS
ADDRESSES
A2 A1 A0
REGISTER
READ/WRITE
COMMENTS
16C550 COMPATIBLE REGISTERS
0
0 0
RHR - Receive Holding Register
THR - Transmit Holding Register
Read-only
Write-only
LCR[7] = 0
0
0 0
DLL - Divisor LSB
Read/Write
LCR[7] = 1, LCR
≠ 0xBF
0
0 1
DLM - Divisor MSB
Read/Write
0
1 0
DLD - Divisor Fractional
Read/Write
LCR[7] = 1, LCR
≠ 0xBF,
EFR[4] = 1
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
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
≠ 0xBF
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
Read-only
1
1 0
MSR - Modem Status Register
Read-only
1
1 1
SPR - Scratch Pad Register
Read/Write
LCR
≠ 0xBF, FCTR[6] = 0
1
1 1
FLVL - RX/TX FIFO Level Counter Register
Read-only
LCR
≠ 0xBF, FCTR[6] = 1
1
1 1
EMSR - Enhanced Mode Select Register
Write-only
ENHANCED REGISTERS
0
0 0
TRG - RX/TX FIFO Trigger Level Register
FC - RX/TX FIFO Level Counter Register
Write-only
Read-only
LCR = 0xBF
0
0 1
FCTR - Feature Control Register
Read/Write
0
1 0
EFR - Enhanced Function Register
Read/Write
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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