ST16C550_05 Datasheet, PDF (20/35 Pages) Exar Corporation – UART WITH 16-BYTE FIFO’s

ST16C550
ST16C550 EXTERNAL RESET CONDITIONS
REGISTERS RESET STATE
IER
ISR
LCR, MCR
LSR
MSR
FCR
IER BITS 0-7 = logic 0
ISR BIT-0=1, ISR BITS 1-7 = logic
0
BITS 0-7 = logic 0
LSR BITS 0-4 = logic 0,
LSR BITS 5-6 = logic 1 LSR, BIT
7 = logic 0
MSR BITS 0-3 = logic 0,
MSR BITS 4-7 = logic levels of the
input signals
BITS 0-7 = logic 0
SIGNALS
TX
-OP1
-OP2
-RTS
-DTR
-RXRDY
-TXRDY
INT
RESET STATE
Logic 1
Logic 1
Logic 1
Logic 1
Logic 1
Logic 1
Logic 0
Logic 0
Rev. 5.01
20