MEC1404 Datasheet, PDF (410/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
Note:
Pull-up resistors are required on both the KSI and KSO pins. Either external 10k ohm resistors or the internal
resistors may be used. However, if the internal pull-ups are used then the PreDrive Mode must also be
enabled.
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
VTR
Name
30.7.2 CLOCK INPUTS
Description
The logic and registers implemented in this block are powered by this
power well.
Name
48 MHz Ring Oscillator
30.7.3 RESETS
Description
This is the clock source for Keyboard Scan Interface logic.
Name
Description
nSYSRST
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.
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.
DS00001956D-page 410
 2015 - 2016 Microchip Technology Inc.