LPC47N227-MN View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'LPC47N227-MN' PDF : 202 Pages View PDF
the interrupt system inhibits the Interrupt Identification Register and disables any Serial Port interrupt out of
the LPC47N227. All other system functions operate in their normal manner, including the Line Status and
MODEM Status Registers. The contents of the Interrupt Enable Register are described below.
Bit 0
This bit enables the Received Data Available Interrupt (and timeout interrupts in the FIFO mode) when set
to logic "1".
Bit 1
This bit enables the Transmitter Holding Register Empty Interrupt when set to logic "1".
Bit 2
This bit enables the Received Line Status Interrupt when set to logic "1". The error sources causing the
interrupt are Overrun, Parity, Framing and Break. The Line Status Register must be read to determine the
source.
Bit 3
This bit enables the MODEM Status Interrupt when set to logic "1". This is caused when one of the Modem
Status Register bits changes state.
Bits 4 through 7
These bits are always logic "0".
FIFO Control Register (FCR)
Address Offset = 2H, DLAB = X, WRITE
This is a write only register at the same location as the IIR. This register is used to enable and clear the
FIFOs, set the RCVR FIFO trigger level. Note: DMA is not supported. The UART1 and UART2 FCR’s are
shadowed in the UART1 FIFO Control Shadow Register (CR15) and UART2 FIFO Control Shadow
Register (CR16). See the Configuration section for description on these registers.
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