w83l517g Winbond Electronics Corp America, w83l517g Datasheet - Page 50
w83l517g
Manufacturer Part Number
w83l517g
Description
Winbond Lpc I/o For Notebook W83l517d/ W83l517d-f
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83L517G.pdf
(133 pages)
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7.2.4
This register reflects the current state of four input pins for handshake peripherals such as a modem
and records changes on these pins.
Bit 7: This bit is the opposite of the DCD input. This bit is equivalent to bit 3 of HCR in loopback
mode.
Bit 6: This bit is the opposite of the RI input. This bit is equivalent to bit 2 of HCR in loopback mode.
Bit 5: This bit is the opposite of the DSR input. This bit is equivalent to bit 0 of HCR in loopback
mode.
Bit 4: This bit is the opposite of the CTS input. This bit is equivalent to bit 1 of HCR in loopback
mode.
Bit 3: TDCD. This bit indicates that the DCD pin has changed state after HSR was read by the
Bit 2: FERI. This bit indicates that the RI pin has changed from low to high state after HSR was read
Bit 1: TDSR. This bit indicates that the DSR pin has changed state after HSR was read by the CPU.
Bit 0: TCTS. This bit indicates that the CTS pin has changed state after HSR was read.
Handshake Status Register (HSR) (Read/Write)
CPU.
by the CPU.
7
6
5
4
3
2
1
- 50 -
0
Clear to send (CTS)
Data set ready (DSR)
Ring indicator (RI)
Data carrier detect (DCD)
RI falling edge (FERI)
DCD toggling (TDCD)
CTS toggling (TCTS)
DSR toggling (TDSR)
W83L517D/W83L517D-F
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