System Installation
NANO-8045 User’s Manual
3-7
3.6 GPIO
Function
J22 : General Purpose Input/Output Interface Connector
There are 8 GPIO pins on Nano-8045.
GP10, GP11, GP12 and GP13 are dedicated
GPO pins with 12mA current sink capacity at 5V signal level. The output signals
have internal weak pull-high resistor, 4.7K Ohm, to 5V.The GPO signals are
driven by W83627DHG GP30 ~ 33 pins.
GP14, GP15, GP16 and GP17 are dedicated GPI pins. They are first inverted and
then connected to W83627DHG GP34~37 pins.
Refer to the W83627DHG data sheet to configure both input / output port ,
SGP30~37, by programming W83627DHG GPIO registers. Users can configure each
individual port to be an input or output port by programming respective bit in
selection register (0 =output, 1 = input). Invert port value by setting inversion register
(0 = non -inverse, 1 = inverse). Port value is read / written through data register.
In addition, only GP30, GP31 and GP35 are designed to be able to assert PSOUT# or
PME# signal to wake up the system if any of them has any transitions. There are
about 16mS debounced circuit inside these 3 GPIOs and it can be disabled by
programming respective bit (LD9, CR[FEh] bit 4~6).
