ST16C1450CJ28 EXAR [Exar Corporation], ST16C1450CJ28 Datasheet - Page 21

• Manufacturer Part Number: ST16C1450CJ28
• Description: 2.97V TO 5.5V UART
• Manufacturer: EXAR [Exar Corporation]

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REV. 4.2.0
CTS# (active high, logical 1). Normally this bit is the compliment of the CTS# input. In the loopback mode, this
bit is equivalent to bit-1 in the MCR register. The CTS# input may be used as a general purpose input when the
modem interface is not used.
MSR[5]: DSR Input Status
DSR# (active high, logical 1). Normally this bit is the compliment of the DSR# input. In the loopback mode, this
bit is equivalent to bit-0 in the MCR register. The DSR# input may be used as a general purpose input when the
modem interface is not used.
MSR[6]: RI Input Status
RI# (active high, logical 1). Normally this bit is the compliment of the RI# input. In the loopback mode this bit is
equivalent to bit-2 in the MCR register. The RI# input may be used as a general purpose input when the
modem interface is not used.
MSR[7]: CD Input Status
CD# (active high, logical 1). Normally this bit is the compliment of the CD# input. In the loopback mode this bit
is equivalent to bit-3 in the MCR register. The CD# input may be used as a general purpose input when the
modem interface is not used.
This is a 8-bit general purpose register for the user to store temporary data. The content of this register is
preserved during sleep mode but becomes 0xFF (default) after a reset or a power off-on cycle.
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4.9
Scratch Pad Register (SPR) - Read/Write
I/O SIGNALS
REGISTERS
RTS#
DTR#
MCR
MSR
DLM
RHR
SPR
THR
LCR
LSR
RST
DLL
IER
ISR
INT
TX
T
ABLE
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
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
Logic 1
Logic 1
Logic 1
Logic 1
Three-State Condition
6: UART RESET CONDITIONS
21
RESET STATE
RESET STATE
2.97V TO 5.5V UART
ST16C1450/51