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ZWIR4512AC2XI Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 26 page ZWIR4512 Secure Low-Power Wireless IPv6 Module Data Sheet April 15, 2013 © 2013 Zentrum Mikroelektronik Dresden AG — Rev. 1.00 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice. 9 of 25 2.2. Microcontroller The protocol stack and the user application are executed on an STM32F103RC microcontroller (MCU) from ST Microelectronics. It provides 256 kB flash and 48 kB SRAM memory. The MCU provides a rich set of peripherals and a number of general purpose input/output (GPIO) ports. The GPIO ports of the module are directly connected to the GPIOs of the MCU. Refer to Table 4.1 for an exact mapping. 2.2.1. MCU Core The MCU core is an ARM ® Cortex™-M3. This is a 32-bit RISC core with a performance of 1.25 DMIPS/MHz. Using ZMDI ’s software stack, the maximum operating frequency is 64 MHz. This allows for computational intensive applications. In order to save power, the core can be shut off completely, waking up only on external activity. 2.2.2. Peripherals and Interfaces The module was designed to make maximum use of the controller ’s internal peripherals. Up to 21 digital general purpose I/Os can be used by the application. Most of these I/Os have alternative functions. Some of them are 5V-tolerant. Table 4.1 shows the most commonly used functions available for each interface. Table 4.3 shows all functionalities on a single page, indicating which peripherals must not be used in parallel as their GPIOs are interfering. In addition to communication interfaces, the module also provides signal conversion peripherals. Three analog-to- digital converters (ADCs), two digital-to-analog converters (DACs) and two pulse-width modulation (PWM) peripherals are available. 2.2.3. Programming and Debugging Programming and debugging the module is typically done via JTAG. All required MCU ports are connected to module pins for that purpose. Alternatively, Serial Wire Debug (SWD) can be used for programming and debugging. This requires just two pins that have to be reserved, providing two additional GPIO pins. Alternatively, if debug functionality is not required, it is possible to program the module over a two-wire UART interface. For that purpose, the MCU ’s internal boot-loader must be started. This is done by holding the BSEL pin of the module high while a reset is performed or the module is powered on. Refer to the MCU documentation for more information about serial programming. 2.3. Firmware 2.3.1. Serial Command Interface (SCI) Firmware A module programmed with the Serial Command Interface firmware acts as a network processor. In this configuration, the module is controlled over a serial interface that is SPI, USB, or one of the two UARTs. The SCI firmware provides all standard communication functions for data transmission and reception, as well as all security functions and over-the-air update (OTAU) functionality. Access to internal peripherals is limited to digital control of the GPIO pins. Typically, an external microcontroller or a PC is required to control module operation. However, for simple sensing or acting applications, it is also possible to configure the module to run autonomously without the need for an external controller. Refer to the ZWIR45xx Serial Command Interface Manual for further information. 2.3.2. C Application Programming Interface (C-API) A C-API is provided for applications that should run directly on the embedded microcontroller. Communication and security functionalities are encapsulated in a set of libraries that export functions for accessing and controlling them. The library architecture is modular, allowing tailoring applications to user needs. Applications running on the microcontroller can make use of the rich set of peripherals that are provided by the controller. |
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