w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 166

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

CRF1 (Default 0x00)
These bits indicate that the individual device's idle timer expires due to no I/O access, no IRQ, and no
external input to the device. These 5 bits are controlled by the IR, printer port, FDC, UART A, and
UART B power down machines individually. Writing a 1 clears this bit, and writing a 0 has no effect.
Note that the user is not supposed to change the status while the power management function is
enabled.
Bit 0
Bit 7
Bit 6
Bit 5 - 4
Bit 3
Bit 2
Bit 1
Bit 0
: Reserved. Return zero when read.
: IRIDLSTS. IR idle status
= 0
= 1
: Reserved. Return zero when read.
: PRTIDLSTS. Printer port idle status.
= 0
= 1
pins
: FDCIDLSTS. FDC idle status.
= 0
= 1
: URAIDLSTS. UART A idle status.
= 0
= 1
: URBIDLSTS. UART B idle status.
= 0
= 1
= 1
is
: URBPME. UART B power management enable.
= 0
= 1
is
IR is now in the working state.
IR is now in the sleeping state due to no IR access, no IRQ, the receiver is
printer port is now in the working state.
printer port is now in the sleeping state due to no printer port access, no IRQ, no
DMA acknowledge, and no transition on BUSY, ACK , PE, SLCT, and ERR
in a preset expiry time period.
FDC is now in the working state.
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 in a
UART A is now in the working state.
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 in a preset expiry time period.
UART B is now in the working state.
UART B 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 in a preset expiry time period.
now waiting for a start bit, and the transmitter shift register is now empty in a
preset expiry time period.
preset expiry time period
enable the auto power management functions provided CRF0.bit7 (CHIPPME)
also set to 1.
disable the auto power management functions.
enable the auto power management functions provided CRF0.bit7 (CHIPPME)
also set to 1.
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W83977ATF/W83977ATG