MEC1322 Datasheet, PDF (352/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
30.6 Host Interface
The registers defined for the Keyboard Scan Interface are accessible by the various hosts as indicated in Section 30.11,
"EC-Only Registers".
30.7 Power, Clocks and Reset
This section defines the Power, Clock, and Reset parameters of the block.
30.7.1 POWER DOMAINS
TABLE 30-2:
POWER SOURCES
Name
VCC1
30.7.2 CLOCK INPUTS
Description
The logic and registers implemented in this block are powered by this
power well.
TABLE 30-3: CLOCK INPUTS
Name
48 MHz Ring Oscillator
30.7.3 RESETS
Description
This is the clock source for Keyboard Scan Interface logic.
TABLE 30-4: RESET SIGNALS
Name
VCC1_RESET
Description
This signal resets all the registers and logic in this block to their default
state.
30.8 Interrupts
This section defines the Interrupt Sources generated from this block.
TABLE 30-5: EC INTERRUPTS
Source
KSC_INT
KSC_INT_WAKE
Description
Interrupt request to the Interrupt Aggregator.
Wake-up request to the Interrupt Aggregator’s wake-up interface.
30.9 Low Power Modes
The Keyboard Scan Interface automatically enters a low power mode whenever it is not actively scanning the keyboard
matrix. The block is also placed in a low-power state when it is disabled by the KSEN bit. When the interface is in a low-
power mode it will not prevent the chip from entering a sleep state. When the interface is active it will inhibit the chip
sleep state until the interface has re-entered its low power mode.
DS00001719D-page 352
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