W83877ATG Nuvoton Technology Corporation of America, W83877ATG Datasheet - Page 152

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

Specifications of W83877ATG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

11.2.51
When the device is in Extended Function mode and EFIR is 41H, the CR41 register can be accessed
through EFDR. The bit definitions are as follows:
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Devices' trap status.
These bits indicate that the individual device wakes up due to any I/O access, IRQ, and external input
to the device respectively. The device's idle timer reloads the initial count value from CR35-CR39,
depending on which device wakes up. These 4 bits are controlled by the printer port, FDC, UART A,
and UART B power down machines individually. The bits are set/cleared by W83877ATF/ATG
automatically. Writing a 1 can also clear this bit, and writing a 0 has no effect.
PRTTRAPSTS (Bit 3): printer port trap status.
FDCTRAPSTS (Bit 2): FDC trap status.
URATRAPSTS (Bit 1): UART A trap status.
URBTRAPSTS (Bit 0): UART B trap status.
0
1
0
1
0
1
0
1
Configuration Register 41 (CR41), default=00H
the printer port is now in the sleeping state.
the printer port is now in the working state due to any printer port access, any IRQ, any
DMA acknowledge, and any transition on BUSY, ACK , PE, SLCT, and ERR pins.
FDC is now in the sleeping state.
FDC is now in the working state due to any FDC access, any IRQ, any DMA
acknowledge, and any enabling of the motor enable bits in the DOR register.
UART A is now in the sleeping state.
UART A is now in the working state due to any UART A access, any IRQ, the receiver
begins receiving a start bit, the transmitter shift register begins transmitting a start bit,
and any transition on MODEM control input lines.
UART B is now in the sleeping state.
UART B is now in the working state due to any UART B access, any IRQ, the receiver
begins receiving a start bit, the transmitter shift register begins transmitting a start bit,
and any transition on MODEM control input lines.
7
6
5
4
3
2
- 145 -
1
W83877ATF/W83877ATG
0
Publication Release Date:November 2006
URBTRAPSTS
URATRAPSTS
FDCTRAPSTS
PRTTRAPSTS
reserved
reserved
reserved
reserved
Version 1.0