mcs7705 MosChip, mcs7705 Datasheet - Page 12

• Manufacturer Part Number: mcs7705
• Description: Usb 1.1 To Single Printer Port
• Manufacturer: MosChip

Page 12
MCS7705
USB 1.1 to Single Printer Port
Parallel Printer Port Register Descriptions
Data Register
The Data Register is cleared at initialization by RESET. During a write operation, the contents of this register
are buffered and output onto the PD7-PD0 ports. During a read operation PD7-PD0 ports are buffered and
output to the host CPU.
Register:
Description:
Offset:
Permissions:
Access Condition:
Device Status Register
The bits of the status register are defined as follows:
Register:
Description:
Offset:
Permissions:
Access Condition:
Bit
0
1
2
3
4
5
6
7
nBUSY
Bit[7]
Bit[7]
Unused
Unused
Unused
nBUSY
FAULT
Name
nACK
SLCT
PE
PP_DPR
Parallel Printer Data Register
000
Read/Write
Application Number = 0x0100
DSR
Device Status Register
001
Read
Application Number = 0x0100
nACK
Bit[6]
Bit[6]
Not used, set to 0
Not used, set to 0
Not used, set to 0
Logic 0 = Printer reports error condition
Logic 1 = Normal operation.
Logic 0 = Printer is off line.
Logic 1 = Printer is on line.
Logic 0 = Normal operation
Logic 1 = Paper end/empty is detected
Logic 0 = State of the nACK pin (ACK = High).
Logic 1 = State of the nACK pin (ACK = Low).
Logic 0 = nBUSY pin is high, printer is not ready to take data.
Logic 1 = nBUSY pin is low, printer is ready to take data.
Bit[5]
Bit[5]
PE
Parallel Printer Data
Bit[4]
Bit[4]
SLCT
Description
FAULT
Bit[3]
Bit[3]
Unused
Bit[2]
Bit[2]
Unused
Bit[1]
Bit[1]
Unused
Bit[0]
Bit[0]
Rev. 1.7