XR16M570 Datasheet, PDF (25/52 Pages) Exar Corporation – 1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO

XR16M570
REV. 1.0.0
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO
TABLE 7: INTERNAL REGISTERS DESCRIPTION. SHADED BITS ARE ENABLED WHEN EFR BIT-4=1
ADDRESS REG READ/
A2-A0 NAME WRITE
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3 BIT-2 BIT-1 BIT-0 COMMENT
Baud Rate Generator Divisor
0 0 0 DREV RD
0 0 1 DVID RD
Bit-7
0
Bit-6
0
Bit-5
0
Bit-4
0
Bit-3
0
Bit-2
0
Bit-1
0
Bit-0
1
LCR[7] = 1
LCR≠0xBF
DLL= 0x00
DLM= 0x00
000
001
DLL RD/WR
DLM RD/WR
Bit-7
Bit-7
Bit-6
Bit-6
Bit-5
Bit-5
Bit-4
Bit-4
Bit-3
Bit-3
Bit-2
Bit-2
Bit-1
Bit-1
Bit-0
Bit-0
LCR[7] = 1
LCR≠0xBF
DLD[7:6]
010
DLD
RD/WR
BRG
select
Enable 4X Mode 8X Mode
Indepen-
dent
BRG
Bit-3
Bit-2
Bit-1
Bit-0
LCR[7] = 1
LCR≠0xBF
EFR[4] = 1
Enhanced Registers
000
FC
RD Bit-7 Bit-6 Bit-5
Bit-4
Bit-3 Bit-2 Bit-1 Bit-0 LCR=0XBF
0 0 1 FCTR RD/WR RX/TX Swap
0
select SCR
0
RS485 invert 0
0
interrupt RX IR
mode
010
EFR
RD/WR Auto
CTS#
Enable
Auto
RTS#
Enable
Special Enable
Char _{IER [7:4],}
Select _{ISR [5:4],}
FCR[5:3],
MCR[7:5],
DLD
Soft-
ware
Flow
Cntl
Bit-3
Soft-
ware
Flow
Cntl
Bit-2
Soft-
ware
Flow
Cntl
Bit-1
Soft-
ware
Flow
Cntl
Bit-0
1 0 0 XON1 RD/WR Bit-7 Bit-6 Bit-5
Bit-4
Bit-3 Bit-2 Bit-1 Bit-0
1 0 1 XON2 RD/WR Bit-7 Bit-6 Bit-5
Bit-4
Bit-3 Bit-2 Bit-1 Bit-0
1 1 0 XOFF1 RD/WR Bit-7 Bit-6 Bit-5
Bit-4
Bit-3 Bit-2 Bit-1 Bit-0
1 1 1 XOFF2 RD/WR Bit-7 Bit-6 Bit-5
Bit-4
Bit-3 Bit-2 Bit-1 Bit-0
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1 Receive Holding Register (RHR) - Read- Only
SEE”RECEIVER” ON PAGE 14.
4.2 Transmit Holding Register (THR) - Write-Only
SEE”TRANSMITTER” ON PAGE 13.
25