Microchip Technology MRF24WN0MA, Руководство пользователя

Страница: 11 / 37


2015 Microchip Technology Inc.
Advance Information
DS50002410A-page 11
MRF24WN0MA/MB
2.0 CIRCUIT DESCRIPTION
2.1 Overview
The MRF24WN0MA/MB module interfaces to the
PIC32 MCU via a 4-wire SPI port, Interrupt and Hiber-
nate pins as illustrated in
Figure 2-1 . The
MRF24WN0MA/MB modules are designed to work
with Microchip's MPLAB
®
Harmony Integrated Soft-
ware Framework. The integrated framework imple-
ments the Application Programming Interface (API)
that is used for command and control, management
and data packet traffic.
The MPLAB Harmony basic framework is available via
a free download from the Microchip web site at
http://www.microchip.com/harmony . For more informa-
tion on the basic framework and available release ver-
sions, refer to the
“MPLAB Harmony Release Notes
and Contents” found under the Documentation tab.
If you are new to the MPLAB Harmony framework, visit
http://www.microchip.com/harmony and go to the
Training > Getting Started tab.
The MPLAB Harmony Help document is available for
download from the MPLAB Harmony framework direc-
tory:
c:\microchip\harmony\<version>\doc
.
The PIC32 input/output ports (SPI, Interrupt and Hiber-
nate) are configured in the MPLAB Harmony frame-
work configuration files as described in the MPLAB
Harmony Help document.
2.2 MODE0 and MODE1 Pins
The MODE pins must be tied to the voltage levels for
normal operation of the module. Refer to
Table 2-1 .
The MODE pins are sampled at power on and wake-
up. Refer to
Section 2.6, "Hibernate" . In the case of
SPI_CS/MODE1 pin, pull-up using a 10 k

resistor and
the host MCU allows an active-high signal during
power on and wake-up to ensure that the module start-
up in normal operation. Once the module is
operational, the pin becomes the SPI Port Chip Select
pin (active-low).
FIGURE 2-1: HARMONY TO MRF24WN0MA/MB BLOCK DIAGRAM
TABLE 2-1: MODE PIN OPERATION
Pin Condition
MODE0 Connect to GND
SPI_CS/MODE1 Connect to VDD via 10 k

pull-up resistor
Hibernate
Interrup
t
Application(s)
TCP/IP Stack
Wi-Fi Driver
PLIB
PIC32
SPI
MRF24WN0MA/MB
Power
Ground