SC16IS762 Philips Semiconductors, SC16IS762 Datasheet - Page 24

• Manufacturer Part Number: SC16IS762
• Description: (SC16IS752 / SC16IS762) Dual UART
• Manufacturer: Philips Semiconductors

NXP Semiconductors
SC16IS752_SC16IS762_6
Product data sheet
8.5 Interrupt Identification Register (IIR)
8.6 Line Control Register (LCR)
The IIR is a read-only 8-bit register which provides the source of the interrupt in a
prioritized manner.
Table 13.
Table 14.
[1]
This register controls the data communication format. The word length, number of stop
bits, and parity type are selected by writing the appropriate bits to the LCR.
shows the Line Control Register bit settings.
Table 15.
Bit
7:6
5:1
0
Priority
level
1
2
2
3
4
5
6
7
Bit
7
6
Modem interrupt status must be read via MSR register and GPIO interrupt status must be read via IOState
register.
Symbol
IIR[7:6]
IIR[5:1]
IIR[0]
Symbol
LCR[7]
LCR[6]
Interrupt Identification Register bits description
Interrupt source
IIR[5]
0
0
0
0
0
1
0
1
Line Control Register bits description
Table 13
IIR[4]
0
0
0
0
0
1
1
0
Rev. 06 — 19 December 2006
Dual UART with I
Description
Mirror the contents of FCR[0].
5-bit encoded interrupt. See
Interrupt status.
Description
Divisor latch enable.
Break control bit. When enabled, the Break control bit causes a break
condition to be transmitted (the TX output is forced to a logic 0 state).
This condition exists until disabled by setting LCR[6] to a logic 0.
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
logic 0 = divisor latch disabled (normal default condition)
logic 1 = divisor latch enabled
logic 0 = no TX break condition (normal default condition)
logic 1 = forces the transmitter output (TX) to a logic 0 to alert the
communication terminal to a line break condition
IIR[3]
0
1
0
0
0
0
0
0
shows Interrupt Identification Register bit settings.
IIR[2]
1
1
1
0
0
0
0
0
2
SC16IS752/SC16IS762
C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
IIR[1]
1
0
0
1
0
0
0
0
Table
IIR[0]
0
0
0
0
0
0
0
0
14.
Source of the interrupt
Receive Line Status error
Receiver time-out interrupt
RHR interrupt
THR interrupt
modem interrupt
input pin change of state
received Xoff signal/special
character
CTS, RTS change of state
from active (LOW) to
inactive (HIGH)
© NXP B.V. 2006. All rights reserved.
Table 15
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