W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 130

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

CR26 (Default 0b0s000000)
CR28 (Default 0x00)
Bit 5 : URBTRI
Bit 4 : URATRI
Bit 3 : PRTTRI
Bit 2 : IRTRI [W83977AF only]
Bit 1 : Reserved.
Bit 0 : FDCTRI.
Bit 7 : SEL4FDD
Bit 6 : HEFRAS
HEFRAS Address and Value
Bit 5 : LOCKREG
= 0 Enable R/W Configuration Registers.
Bit 4 : DSIRLGRQ [W83977AF only]
in selecting IRQ and DRQ.
Bit 3 : DSFDLGRQ
Bit 2 : DSPRLGRQ
selecting IRQ
on selecting IRQ
Bit 1 : DSUALGRQ
IRQ
Bit 0 : DSUBLGRQ
IRQ
selecting IRQ
Bit 7-5: Reserved.
Bit 4 : IRQ Sharing selection.
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
= 0
= 1
= 0 Write 87h to the location 3F0h twice.
= 1 Write 87h to the location 370h twice.
= 1 Disable R/W Configuration Registers.
= 0 Enable IR legacy mode on IRQ and DRQ selection, then MCR register bit 3 is effective
= 1 Disable IR legacy mode on IRQ and DRQ selection, then MCR register bit 3 is not
= 0 Enable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is effective
= 1 Disable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is not
= 0 Enable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is effective on
= 1 Disable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is not effective
= 0 Enable UART B legacy mode IRQ selecting, then MCR bit 3 is effective on selecting
= 1 Disable UART B legacy mode IRQ selecting, then MCR bit 3 is not effective on
= 0 Enable UART A legacy mode IRQ selecting, then MCR bit 3 is effective on selecting
These two bits define how to enable Configuration mode.
effective in selecting IRQ and DRQ.
in selecting IRQ
effective in selecting IRQ
= 1 Disable UART A legacy mode IRQ selecting, then MCR bit 3 is not effective on
selecting IRQ
Select two FDD mode.
Select four FDD mode.
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