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.