xr16v654 Exar Corporation, xr16v654 Datasheet - Page 26

• Manufacturer Part Number: xr16v654
• Description: 2.25v To 3.6v Quad Uart With 64-byte Fifo
• Manufacturer: Exar Corporation

XR16V654/654D
2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO
Each UART channel in the V654 has its own set of configuration registers selected by address lines A0, A1
and A2 with a specific channel selected (See
Table 9
.
3.0 UART INTERNAL REGISTERS
A2,A1,A0 A
X
and
0
0
0
0
0
0
1
1
1
1
0
1
1
1
1
0
X X
0 0
0 1
1 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
1 0
0 0
0 1
1 0
1 1
0 0
Table
DDRESSES
10.
T
ABLE
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Divisor LSB
DLM - Divisor MSB
DLD - Divisor Fractional
IER - Interrupt Enable Register
ISR - Interrupt Status Register
FCR - FIFO Control Register
LCR - Line Control Register
MCR - Modem Control Register
LSR - Line Status Register
MSR - Modem Status Register
SPR - Scratch Pad Register
EFR - Enhanced Function Reg
Xon-1 - Xon Character 1
Xon-2 - Xon Character 2
Xoff-1 - Xoff Character 1
Xoff-2 - Xoff Character 2
FSTAT - FIFO Status Register
9: UART CHANNEL A AND B UART INTERNAL REGISTERS
16C550 C
R
EGISTER
E
NHANCED
Table 1
OMPATIBLE
26
R
and
EGISTERS
R
Table
EGISTERS
2). The complete register set is shown on
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Write-only
Read-only
Write-only
Read-only
Read-only
Read-only
EAD
/W
RITE
LCR[7] = 1, LCR ≠ 0xBF
FSRS# pin is LOW
LCR = 0xBF
C
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
OMMENTS
REV. 1.0.1