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| XR19L220_07 Datasheet, PDF (18/43 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER | |||
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XR19L220
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
REV. 1.0.1
3.0 UART INTERNAL REGISTERS
The L220 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 5 and Table 6.
TABLE 5: UART INTERNAL REGISTERS
ADDRESSES
A2 A1 A0
REGISTER
READ/WRITE
COMMENTS
16C550 COMPATIBLE REGISTERS
0 00
RHR - Receive Holding Register
THR - Transmit Holding Register
Read-only
Write-only
LCR[7] = 0
0 00
DLL - Divisor Latch Low Byte
Read/Write
LCR[7] = 1
0 01
DLM - Divisor Latch High Byte
Read/Write
0 00
0 01
DREV - Device Revision Code
DVID - Device Identification Code
Read-only
Read-only
DLL = 0x00, DLM = 0x00
and LCR[7] = 1
0 01
IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0 10
ISR - Interrupt Status Register
FCR - FIFO Control Register
Read-only
Write-only
LCR â 0xBF
0 11
LCR - Line Control Register
Read/Write
1 00
MCR - Modem Control Register
Read/Write
LCR â 0xBF
1 01
LSR - Line Status Register
Read-only
1 10
MSR - Modem Status Register
Read-only
1 11
SPR - Scratchpad Register
Read/Write
LCR â 0xBF
ENHANCED REGISTERS
0 10
EFR - Enhanced Function Register
Read/Write
LCR = 0xBF
1 00
Xon-1 - Xon Character 1
Write
1 01
Xon-2 - Xon Character 2
Write
1 10
Xoff-1 - Xoff Character 1
Write
1 11
Xoff-2 - Xoff Character 2
Write
18
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