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ST16C2450CQ48 Scheda tecnica(PDF) 11 Page - Exar Corporation

Il numero della parte ST16C2450CQ48
Spiegazioni elettronici  2.97V TO 5.5V DUART
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Produttore elettronici  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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ST16C2450
REV. 4.0.1
2.97V TO 5.5V DUART
11
3.0 UART INTERNAL REGISTERS
Each of the UART channel in the 2450 has its own set of configuration registers selected by address lines A0,
A1 and A2 with CSA# or CSB# selecting the channel. The registers are 16C450 compatible. The complete
register set is shown on Table 4 and Table 5.
TABLE 4: UART CHANNEL A AND B UART INTERNAL REGISTERS
A2,A1,A0 ADDRESSES
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 - Div Latch Low Byte
Read/Write
LCR[7] = 1
0 0 1
DLM - Div Latch High Byte
Read/Write
LCR[7] = 1
0 0 1
IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0 1 0
ISR - Interrupt Status Register
Reserved
Read-only
Write-only
0 1 1
LCR - Line Control Register
Read/Write
1 0 0
MCR - Modem Control Register
Read/Write
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


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