ST16C450 Exar Corporation, ST16C450 Datasheet - Page 17

• Manufacturer Part Number: ST16C450
• Description: UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
• Manufacturer: Exar Corporation

Scratchpad Register (SPR)
The ST16C450 provides a temporary data register to
store 8 bits of user information.
ST16C450 EXTERNAL RESET CONDITIONS
REGISTERS
IER
ISR
LCR, MCR
LSR
MSR
SIGNALS
T X
-OP1
-OP2
-RTS
-DTR
CSOUT
INT
Rev. 4.20
MSR BITS 0-3 = logic 0,
RESET STATE
RESET STATE
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 4-7 = logic levels of the
input signals
Logic 1
Logic 1
Logic 1
Logic 1
Logic 1
Logic 0
Logic 0
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ST16C450