參數(shù)資料
型號(hào)： LPC47S422QFP
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 外設(shè)及接口
英文描述： ENHANCED SUPER I/O WITH LPC INTERFACE FOR SERVER APPLICATIONS
中文描述： MULTIFUNCTION PERIPHERAL, PQFP100
封裝： QFP-100
文件頁(yè)數(shù)： 92/264頁(yè)
文件大小： 1342K
代理商： LPC47S422QFP
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The Data Port is located at an offset of '00H' from the base address. The data register is cleared at
initialization by RESET. During a WRITE operation, the Data Register latches the contents of the internal
data bus. The contents of this register are buffered (non inverting) and output onto the PD0 - PD7 ports.
During a READ operation in SPP mode, PD0 - PD7 ports are buffered (not latched) and output to the host
CPU.
Status Port
ADDRESS OFFSET = 01H
The Status Port is located at an offset of '01H' from the base address. The contents of this register are
latched for the duration of a read cycle. The bits of the Status Port are defined as follows:
BIT 0 TMOUT - TIME OUT
This bit is valid in EPP mode only and indicates that a 10 usec time out has occurred on the EPP bus. A
logic O means that no time out error has occurred; a logic 1 means that a time out error has been
detected. This bit is cleared by a RESET. Writing a one to this bit clears the time out status bit. On a
write, this bit is self clearing and does not require a write of a zero. Writing a zero to this bit has no effect.
BITS 1, 2
- are not implemented as register bits, during a read of the Printer Status Register these bits are
a low level.
BIT 3 nERR - nERROR
The level on the nERROR input is read by the CPU as bit 3 of the Printer Status Register. A logic 0
means an error has been detected; a logic 1 means no error has been detected.
BIT 4 SLCT - PRINTER SELECTED STATUS
The level on the SLCT input is read by the CPU as bit 4 of the Printer Status Register. A logic 1 means
the printer is on line; a logic 0 means it is not selected.
BIT 5 PE - PAPER END
The level on the PE input is read by the CPU as bit 5 of the Printer Status Register. A logic 1 indicates a
paper end; a logic 0 indicates the presence of paper.
BIT 6 nACK - nACKNOWLEDGE
The level on the nACK input is read by the CPU as bit 6 of the Printer Status Register. A logic 0 means
that the printer has received a character and can now accept another. A logic 1 means that it is still
processing the last character or has not received the data.
BIT 7 nBUSY - nBUSY
The complement of the level on the BUSY input is read by the CPU as bit 7 of the Printer Status Register.
A logic 0 in this bit means that the printer is busy and cannot accept a new character. A logic 1 means that
it is ready to accept the next character.
Control Port
ADDRESS OFFSET = 02H
The Control Port is located at an offset of '02H' from the base address. The Control Register is initialized
by the RESET input, bits 0 to 5 only being affected; bits 6 and 7 are hard wired low.
92
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