MEC1322 Datasheet, PDF (251/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
Offset ^{See Note 20-5}
Bits
Description
Type
13:12 Mux Control
R/W
The Mux Control field determines the active signal function for a pin.
00 = GPIO Function Selected
01 = Signal Function 1 Selected
10 = Signal Function 2 Selected
11 = Signal Function 3 Selected
11 Polarity
R/W
0 = Non-inverted
1 = Inverted
When the Polarity bit is set to ‘1’ and the Mux Control bits are greater
than ‘00,’ the selected signal function outputs are inverted and Inter-
rupt Detection (int_det) sense defined in Table 20-8, "Edge Enable
and Interrupt Detection Bits Definition" is inverted. When the Mux
Control field selects the GPIO signal function (Mux = ‘00’), the Polar-
ity bit does not effect the output. Regardless of the state of the Mux
Control field and the Polarity bit, the state of the pin is always
reported without inversion in the GPIO input register.
10 Output GPIO Write Enable
R/W
Every GPIO has two mechanisms to set a GPIO data output: Output
GPIO Bit located in the GPIO Output Registers and the Alternative
GPIO data bit located in bit 16 of this register.
This control bit determines the source of the GPIO output.
0 = Alternative GPIO data write enabled
When this bit is zero the Alternative GPIO data write is enabled and
the Output GPIO is disabled.
1 = Output GPIO enable
When this bit is one the Alternative GPIO data write is disabled and
the Output GPIO is enabled.
Default
Note 20-5
Reset
Event
VCC1_R
ESET
Note 20-5 VCC1_R
ESET
Note 20-5 VCC1_R
ESET
Note: See description in Section 20.4, "Accessing GPIOs".
9 GPIO Direction
R/W
0 = Input
1 = Output
The GPIO Direction bit controls the buffer direction only when the
Mux Control field is ‘00’ selecting the pin signal function to be
GPIO. When the Mux Control field is greater than ‘00’ (i.e., a non-
GPIO signal function is selected) the GPIO Direction bit has no affect
and the selected signal function logic directly controls the pin direc-
tion.
Note 20-5 VCC1_R
ESET
 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 251