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4-22 Theory of Operation
4.2.11.1 ALI M6377 Power Management Unit
The major features of the ALI M6377 Power Management Unit include:
♦ Three operation states
— ON state
— DOZE state
— SLEEP state
♦ Programmable DOZE and SLEEP timers
♦ Programmable EL timer for backlight control
♦ Three output pins depending on operation state, each pin is programmable and
power configurable.
♦
Provide system activity monitoring, including:
♦ Video
♦ Hard disk drive
♦ Floppy disk drive
♦ Serial port
♦ Keyboard
♦ Parallel port
♦ Two programmable I/O groups activity monitor, each group contains 16/8
I/O addresses.
♦ One predefined I/O group activity monitor
♦ Multiple external wake up events from DOZE and SLEEP states
♦ External push button
♦ RTC alarm
♦ Two levels battery warning monitor
Port definitions for the M6377 Chip are provided in Table 4-5.