st16c554 Exar Corporation, st16c554 Datasheet - Page 15

• Manufacturer Part Number: st16c554
• Description: Quad Uart With 16-byte Fifos
• Manufacturer: Exar Corporation

REV. 4.0.1
Each UART channel in the 554 has its own set of configuration registers selected by address lines A0, A1 and
A2 with a specific channel selected (See
and
3.0 UART INTERNAL REGISTERS
A2,A1,A0 A
Table
0
0
0
0
0
1
1
1
1
0
8.
0 0
0 1
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
DDRESSES
T
ABLE
RHR - Receive Holding Register
THR - Transmit Holding Register
DLL - Divisor LSB
DLM - Divisor MSB
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
7: UART CHANNEL A AND B UART INTERNAL REGISTERS
16C550 C
R
Table 1
EGISTER
and
OMPATIBLE
15
Table
2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO
R
2). The complete register set is shown on
EGISTERS
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Write-only
Read-only
Write-only
Read-only
Read-only
EAD
/W
RITE
ST16C554/554D
C
LCR[7] = 0
LCR[7] = 1
LCR[7] = 0
LCR[7] = 0
OMMENTS
Table 7