參數(shù)資料
型號(hào)： 37M602
廠商： SMSC Corporation
英文描述： ENHANCED SUPER I/O CONTROLLER WITH INFRARED SUPPORT
中文描述： 增強(qiáng)的超級(jí)I / O控制器，支持紅外線
文件頁(yè)數(shù)： 147/182頁(yè)
文件大?。?/td> 650K
代理商： 37M602
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67
The following section describes the operation of
the registers.
RECEIVE BUFFER REGISTER (RB)
Address Offset = 0H, DLAB = 0, READ ONLY
This register holds the received incoming data
byte. Bit 0 is the least significant bit, which is
transmitted and received first. Received data is
double buffered; this uses an additional shift
register to receive the serial data stream and
convert it to a parallel 8 bit word which is
transferred to the Receive Buffer register. The
shift register is not accessible.
TRANSMIT BUFFER REGISTER (TB)
Address Offset = 0H, DLAB = 0, WRITE ONLY
This register contains the data byte to be
transmitted.
The transmit buffer is double
buffered, utilizing an additional shift register (not
accessible) to convert the 8 bit data word to a
serial format. This shift register is loaded from
the Transmit Buffer when the transmission of
the previous byte is complete.
INTERRUPT ENABLE REGISTER (IER)
Address Offset = 1H, DLAB = 0, READ/WRITE
The lower four bits of this register control the
enables of the five interrupt sources of the Serial
Port interrupt. It is possible to totally disable the
interrupt system by resetting bits 0 through 3 of
this register.
Similarly, setting the appropriate
bits of this register to a high, selected interrupts
can be enabled. Disabling the interrupt system
inhibits the Interrupt Identification Register and
disables any Serial Port interrupt out of the
FDC37M60x. 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 (LD8:CRC3[7:0])
and UART2 FIFO Control Shadow Register
(LD8:CRC4[7:0]).
Bit 0
Setting this bit to a logic "1" enables both the
XMIT and RCVR FIFOs.
Clearing this bit to a
logic "0" disables both the XMIT and RCVR
FIFOs and clears all bytes from both FIFOs.
When changing from FIFO Mode to non-FIFO
(16450) mode, data is automatically cleared
from the FIFOs.
This bit must be a “1” when
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