MEC1404 Datasheet, PDF (337/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
Offset ^{See Table 22-2, "Register Summary"}
Bits
Description
Type
8 Output Buffer Type
R/W
0 = Push-Pull
1 = Open Drain
Note:
Unless explicitly stated otherwise, pins with (I/O/OD) or
(O/OD) in their buffer type column in the tables in are
compliant with the following Programmable OD/PP Multi-
plexing Design Rule: Each compliant pin has a program-
mable open drain/push-pull buffer controlled by the
Output Buffer Type bit in the associated Pin Control
Register. The state of this bit controls the mode of the
interface buffer for all selected functions, including the
GPIO function.
7 Edge Enable (edge_en)
R/W
0 = Edge detection disabled
1 = Edge detection enabled
Default
Note 22-6
Reset
Event
nSYSRS
T
Note 22-6 nSYSRS
T
Note: See Table 22-3, "Edge Enable and Interrupt Detection
Bits Definition".
6:4 Interrupt Detection (int_det)
R/W
The interrupt detection bits determine the event that generates a
GPIO_Event.
Note: See Table 22-3, "Edge Enable and Interrupt Detection
Bits Definition".
Note:
Since the GPIO input is always available, even when the
GPIO is not selected as the alternate function, the GPIO
interrupts may be used for detecting pin activity on alter-
nate functions. The only exception to this is the analog
functions (e.g., ADC, DAC, Comparator inputs)
3:2 Power Gating Signals
R/W
The Power Gating Signals provide the chip Power Emulation
options. The pin will be tristated when the selected power well is off
(i.e., gated) as indicated.
The Emulated Power Well column defined in Pin Multiplexing tables
indicates the emulation options supported for each signal. The Sig-
nal Power Well column defines the buffer power supply per function.
Note: Note that all GPIOs support Power Gating unless other-
wise noted.
00 = VTR
The output buffer is tristated when VTRGD = 0.
01 = VCC
The output buffer is tristate when VCC_PWRGD = 0.
10 = Reserved
11 = Reserved
Note 22-6 nSYSRS
T
Note 22-6 nSYSRS
T
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DS00001956D-page 337