W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 91

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

8.2.2
The system microprocessor can read the printer status by reading the address of the printer status
buffer. The bit definitions are as follows:
Bit 7: This signal is active during data entry, when the printer is off-line during printing, when the print
Bit 6: This bit represents the current state of the printer's ACK signal. A 0 means the printer has
Bit 5: Logical 1 means the printer has detected the end of paper.
Bit 4: Logical 1 means the printer is selected.
Bit 3: Logical 0 means the printer has encountered an error condition.
Bit 1, 2: These two bits are not implemented and are logic one during a read of the status register.
Bit 0: This bit is valid in EPP mode only. It indicates that a 10 μS time-out has occurred on the EPP
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
head is changing position, or during an error state. When this signal is active, the printer is busy
and cannot accept data.
received a character and is ready to accept another. Normally, this signal will be active for
approximately 5 microseconds before BUSY stops.
bus. A logic 0 means that no time-out error has occurred; a logic 1 means that a time-out error
has been detected. Writing a logic 1 to this bit will clear the time-out status bit; writing a logic 0
has no effect.
Printer Status Buffer
7
6
5
4
-83 -
3
1
2
1
1
0
TMOUT
ERROR
SLCT
PE
ACK
BUSY
Publication Release Date: May 2006
Revision 0.60