W83877ATG Nuvoton Technology Corporation of America, W83877ATG Datasheet - Page 153

• Manufacturer Part Number: W83877ATG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83877ATG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

11.2.52
When the device is in Extended Function mode and EFIR is 42H, the CR42 register can be accessed
through EFDR. The bit definitions are as follows:
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Device's IRQ status .
These bits indicate the IRQ pin status of the individual device. The device's IRQ status bit is set or
cleared at their source device; writing a 1 or 0 has no effect.
PRTIRQSTS (Bit 3) : printer port IRQ status. While the IRQ type of printer port is edge trigger-type,
this bit will set and reset immediately. As the software reads this bit, it indicates low level. The
software must read the IRQ status bit in the printer port device register to correctly identify whether the
printer port IRQ occurs.
FDCIRQSTS (Bit 2) : FDC IRQ status.
URAIRQSTS (Bit 1) : UART A IRQ status.
URBIRQSTS (Bit 0) : UART B IRQ status.
11.2.53
When the device is in Extended Function mode and EFIR is 43H, the CR43 register can be accessed
through EFDR. This register is reserved.
11.2.54
When the device is in Extended Function mode and EFIR is 44H, the CR44 register can be accessed
through EFDR. This register is reserved.
Configuration Register 42 (CR42), default=N/A
Configuration Register 43 (CR43), default=00H
Configuration Register 44 (CR44), default=00H
7
6
5
4
3
- 146 -
2
W83877ATF/W83877ATG
1
0
URBIRQSTS
URAIRQSTS
FDCIRQSTS
PRTIRQSTS
reserved
reserved
reserved
reserved