MEC1322 Datasheet, PDF (243/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
20.0 GPIO INTERFACE
20.1 General Description
The MEC1322 GPIO Interface provides general purpose input monitoring and output control, as well as managing many
aspects of pin functionality; including, multi-function Pin Multiplexing Control, GPIO Direction control, PU/PD (PU_PD)
resistors, asynchronous wakeup and synchronous Interrupt Detection (int_det), GPIO Direction, and Polarity control, as
well as control of pin drive strength and slew rate.
Features of the GPIO Interface include:
• Inputs:
- Asynchronous rising and falling edge wakeup detection
- Interrupt High or Low Level
• On Output:
- Push Pull or Open Drain output
• Pull up or pull down resistor control
• Interrupt and wake capability available for all GPIOs
• Programmable pin drive strength and slew rate limiting
• Group- or individual control of GPIO data.
• Multiplexing of all multi-function pins are controlled by the GPIO interface
20.2 Power, Clocks and Reset
This section defines the Power, Clock, and Reset parameters of the block.
20.2.1 POWER DOMAINS
TABLE 20-1: POWER SOURCES
Name
VCC1
20.2.2 CLOCK INPUTS
Description
The registers and logic in this block are powered by VCC1.
TABLE 20-2: CLOCK INPUTS
Name
48 MHz Ring Oscillator
20.2.3 RESETS
Description
The 48 MHz Ring Oscillator is used for synchronizing the GPIO inputs.
TABLE 20-3: RESET SIGNALS
Name
VCC1_RESET
nSIO_RESET
Description
This reset is asserted when VCC1 is applied.
This is an alternate reset condition, typically asserted when the main
power rail is asserted. This reset is used for VCC Power Well Emulation.
 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 243