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參數資料
型號: W83877TF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設及接口
英文描述: Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數: 134/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 108 -
Version 0.61
8.2.47 Configuration Register 40 (CR40), default=00H
When the device is in Extended Function mode and EFIR is 40H, the CR40 register can be accessed
through EFDR. The bit definitions are as follows:
1
2
3
4
5
6
7
0
URBIDLSTS
URAIDLSTS
FDCIDLSTS
PRTIDLSTS
reserved
reserved
reserved
reserved
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Devices' idle status.
These bits indicate that the individual device's idle timer expires due to no I/O access, IRQ, and
external input to the device respectively. 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 W83877TF
automatically. Writing a 1 can also clear this bit, and writing a 0 has no effect.
PRTIDLSTS (Bit 3): printer port idle status.
0
printer port is now in the working state.
1
printer port is now in the sleeping state due to no printer port access, IRQ, DMA
acknowledge, and no transition on BUSY,
ACK
, PE, SLCT, and
ERR
pins.
FDCIDLSTS (Bit 2): FDC idle status.
0
FDC is now in the working state.
1
FDC is now in the sleeping state due to no FDC access, no IRQ, no DMA
acknowledge, and no enabling of the motor enable bits in the DOR register.
URAIDLSTS (Bit 1): UART A idle status.
0
UART A is now in the working state.
1
UART A is now in the sleeping state due to no UART A access, no IRQ, the
receiver is now waiting for a start bit, the transmitter shift register is now empty,
and no transition on MODEM control input lines.
URBIDLSTS (Bit 0): UART B idle status.
0
UART B is now in the working state.
1
UART B is now in the sleeping state due to no UART B access, no IRQ, the
receiver is now waiting for a start bit, the transmitter shift register is now empty,
and no transition on MODEM control input lines.
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