SC16C550IN40 NXP Semiconductors, SC16C550IN40 Datasheet - Page 30

• Manufacturer Part Number: SC16C550IN40
• Manufacturer: NXP Semiconductors

Specifications of SC16C550IN40

• Transmit Fifo: 16Byte
• Receive Fifo: 16Byte
• Transmitter And Receiver Fifo Counter: Yes
• Package Type: PDIP
• Operating Supply Voltage (max): 5.5V
• Mounting: Through Hole
• Pin Count: 40
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Number Of Channels: 1
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
9397 750 11619
Product data
7.10 Enhanced Feature Register (EFR)
7.9 Scratchpad Register (SPR)
Table 20:
[1]
The SC16C550 provides a temporary data register to store 8 bits of user information.
Enhanced features are enabled or disabled using this register.
Bits 0 through 4 provide single or dual character software flow control selection.
When the Xon1 and Xon2 and/or Xoff1 and Xoff2 modes are selected, the double
8-bit words are concatenated into two sequential numbers.
Table 21:
Bit
1
0
Bit
7
6
Whenever any MSR bit 0-3 is set to logic 1, a Modem Status Interrupt will be generated.
Symbol
EFR[7]
EFR[6]
Symbol
MSR[1]
MSR[0]
Modem Status Register bits description
Enhanced Feature Register bits description
Description
Automatic CTS flow control.
Automatic RTS flow control. Automatic RTS may be used for hardware flow
control by enabling EFR[6]. When Auto-RTS is selected, an interrupt will
be generated when the receive FIFO is filled to the programmed trigger
level and RTS will go to a logic 1 at the next trigger level. RTS will return to
a logic 0 when data is unloaded below the next lower trigger level
(programmed trigger level 1). The state of this register bit changes with the
status of the hardware flow control. RTS functions normally when
hardware flow control is disabled.
Rev. 05 — 19 June 2003
Description
Logic 0 = Automatic CTS flow control is disabled (normal default
condition).
Logic 1 = Enable Automatic CTS flow control. Transmission will stop
when CTS goes to a logical 1. Transmission will resume when the CTS
pin returns to a logical 0.
0 = Automatic RTS flow control is disabled (normal default condition).
1 = Enable Automatic RTS flow control.
DSR
CTS
Logic 0 = No DSR change (normal default condition).
Logic 1 = The DSR input to the SC16C550 has changed state since
the last time it was read. A modem Status Interrupt will be generated.
Logic 0 = No CTS change (normal default condition).
Logic 1 = The CTS input to the SC16C550 has changed state since
the last time it was read. A modem Status Interrupt will be generated.
[1]
[1]
UART with 16-byte FIFO and IrDA encoder/decoder
…continued
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
SC16C550
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