SC16C754B NXP Semiconductors, SC16C754B Datasheet - Page 29

• Manufacturer Part Number: SC16C754B
• Description: 5 V - 3.3 V and 2.5 V quad UART - 5 Mbit/s (max.)
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SC16C754B_4
Product data sheet
7.8 Interrupt Enable Register (IER)
The Interrupt Enable Register (IER) enables each of the six types of interrupt, receiver
error, RHR interrupt, THR interrupt, Xoff received, or CTS/RTS change of state from LOW
to HIGH. The INT output signal is activated in response to interrupt generation.
shows the interrupt enable register bit settings.
Table 16.
[1]
Bit
7
6
5
4
3
2
1
0
IER[7:4] can only be modified if EFR[4] is set, that is, EFR[4] is a write enable. Re-enabling IER[1] will
cause a new interrupt if the THR is below the threshold.
Symbol
IER[7]
IER[6]
IER[5]
IER[4]
IER[3]
IER[2]
IER[1]
IER[0]
Interrupt enable register bits description
[1]
[1]
[1]
[1]
Description
CTS interrupt enable.
RTS interrupt enable.
Xoff interrupt.
Sleep mode.
Modem status interrupt.
Receive line status interrupt.
Transmit holding register interrupt.
Receive holding register interrupt.
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
logic 0 = disable the CTS interrupt (normal default condition)
logic 1 = enable the CTS interrupt
logic 0 = disable the RTS interrupt (normal default condition)
logic 1 = enable the RTS interrupt
logic 0 = disable the Xoff interrupt (normal default condition)
logic 1 = enable the Xoff interrupt
logic 0 = disable Sleep mode (normal default condition)
logic 1 = enable Sleep mode. See
logic 0 = disable the modem status register interrupt (normal default
condition)
logic 1 = enable the modem status register interrupt
logic 0 = disable the receiver line status interrupt (normal default condition)
logic 1 = enable the receiver line status interrupt
logic 0 = disable the THR interrupt (normal default condition)
logic 1 = enable the THR interrupt
logic 0 = disable the RHR interrupt (normal default condition)
logic 1 = enable the RHR interrupt
Rev. 04 — 6 October 2008
Section 6.7 “Sleep mode”
SC16C754B
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for details.
Table 16
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