st16c554 Exar Corporation, st16c554 Datasheet - Page 25

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

REV. 4.0.1
T
I/O SIGNALS
REGISTERS
ABLE
DLM, DLL
(16 Mode)
(68 Mode)
RXRDY#
TXRDY#
DTR#
RTS#
MCR
IRQ#
RHR
MSR
IRTX
THR
FCR
LCR
SPR
LSR
IER
ISR
INT
TX
13: UART RESET CONDITIONS FOR CHANNELS A-D
DLM and DLL are unknown upon power up. They do
not reset when the Reset Pin is asserted.
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x01
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x60
Bits 3-0 = Logic 0
Bits 7-4 = Logic levels of the inputs inverted
Bits 7-0 = 0xFF
HIGH
LOW
HIGH
HIGH
HIGH
LOW
ST16C554 = Three-State Condition (INTSEL = LOW)
ST16C554 = LOW (INTSEL = HIGH)
ST16C554D = LOW
HIGH (INTSEL = LOW)
25
RESET STATE
RESET STATE
2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO
ST16C554/554D