sc68c752b NXP Semiconductors, sc68c752b Datasheet - Page 28

• Manufacturer Part Number: sc68c752b
• Description: 5 V, 3.3 V And 2.5 V Dual Uart, 5 Mbit/s Max. , With 64-byte Fifos And Motorola Up Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
SC68C752B_3
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 IRQ output signal is activated in response to interrupt generation.
shows Interrupt Enable Register bit settings.
Table 17:
[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 not
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 dual 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. 03 — 29 November 2005
Section 6.7 “Sleep mode”
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
SC68C752B
for details.
Table 17
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