參數(shù)資料
型號(hào)： 935270056529
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 4 CHANNEL(S), 5M bps, SERIAL COMM CONTROLLER, PQCC68
封裝： PLASTIC, MS-018, SOT-188-2, LCC-68
文件頁(yè)數(shù)： 21/52頁(yè)
文件大小： 680K
代理商： 935270056529
Philips Semiconductors
SC16C754
Quad UART with 64-byte FIFO
Product data
Rev. 02 — 14 March 2003
28 of 49
9397 750 11192
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
[1]
IER[7:4] can only be modied if EFR[4] is set, i.e., EFR[4] is a write enable. Re-enabling IER[1] will
not cause a new interrupt if the THR is below the threshold.
7.9 Interrupt identication register (IIR)
The IIR is a read-only 8-bit register which provides the source of the interrupt in a
prioritized manner. Table 17 shows interrupt identication register bit settings.
The interrupt priority list is shown in Table 18.
4
IER[4] [1]
Sleep mode.
Logic 0 = Disable sleep mode (normal default condition).
Logic 1 = Enable sleep mode. See Section 6.7 “Sleep mode” for details.
3
IER[3]
Modem Status Interrupt.
Logic 0 = Disable the modem status register interrupt (normal default
condition).
Logic 1 = Enable the modem status register interrupt.
2
IER[2]
Receive Line Status interrupt.
Logic 0 = Disable the receiver line status interrupt (normal default
condition).
Logic 1 = Enable the receiver line status interrupt.
1
IER[1]
Transmit Holding Register interrupt.
Logic 0 = Disable the THR interrupt (normal default condition).
Logic 1 = Enable the THR interrupt.
0
IER[0]
Receive Holding Register interrupt.
Logic 0 = Disable the RHR interrupt (normal default condition).
Logic 1 = Enable the RHR interrupt.
Table 16:
Interrupt Enable Register bits description…continued
Bit
Symbol
Description
Table 17:
Interrupt Identication Register bits description
Bit
Symbol
Description
7-6
IIR[7:6]
Mirror the contents of FCR[0].
5
IIR[5]
RTS/CTS LOW-to-HIGH change of state.
4
IIR[4]
1 = Xoff/Special character has been detected.
3-1
IIR[3:1]
3-bit encoded interrupt. See Table 18.
0
IIR[0]
Interrupt status.
Logic 0 = An interrupt is pending.
Logic 1 = No interrupt is pending.
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