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CR16MCT9 Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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CR16MCT9 Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 153 page  7 www.national.com The MICROWIRE interface allows several devices to com- municate over a single system consisting of four wires: serial in, serial out, shift clock, and slave enable. At any given time, the MICROWIRE interface operates as the master or a slave. The support supports the full set of slave select for multi- slave implementation. In master mode, the shift clock is generated on chip under software control. In slave mode, a wake-up out of power- save mode is triggered via the Multi-Input Wake-Up module. 3.14 CR16CAN The CR16CAN device contains a FullCAN class, CAN serial bus interface for applications that require a high speed (up to 1MBits per second) or a low speed interface with CAN bus master capability. The data transfer between CAN and the CPU is established by 15 memory mapped message buffers, which can be individually configured as receive or transmit buffers. An incoming message is filtered by two masks, one for the first 14 message buffers and another one for the 15th message buffer to provide a basic CAN path. A priority de- coder allows any buffer to have the highest or lowest transmit priority. Remote transmission requests can be processed au- tomatically by automatic reconfiguration to a receiver after transmission or by automated transmit scheduling upon re- ception. In addition, a time stamp counter (16-bits wide) is provided to support real time applications. The CR16CAN device is a fast core bus peripheral, which al- lows single cycle byte or word read/write access. A set of di- agnostic features (such as loopback, listen only, and error identification) support the development with the CR16CAN module and provide a sophisticated error management tool. The CR16CAN receiver can trigger a wake-up condition out of the power-save modes via the Multi-Input Wake-Up mod- ule. 3.15 ACCESS.BUS INTERFACE The ACCESS.bus interface module (ACB) is a two-wire seri- al interface with the ACCESS.bus physical layer. It is also compatible with Intel’s System Management Bus (SMBus) and Philips’ I2C bus. The ACB module can be configured as a bus master or slave, and can maintain bi-directional com- munications with both multiple master and slave devices. The ACCESS.bus receiver can trigger a wake-up condition out of the power-save modes via the Multi-Input Wake-Up module. 3.16 A/D CONVERTER The A/D Converter (ADC) module is a 12-channel multi- plexed-input analog-to-digital converter. The A/D Converter receives an analog voltage signal on an input pin and con- verts the analog signal into an 8-bit digital value using suc- cessive approximation. The CPU can then read the result from a memory-mapped register. The module supports four automated operating modes, providing single-channel or 4- channel operation in single or continuous mode. The device has a separate pin, Vref, for the A/D reference voltage. 3.17 ANALOG COMPARATORS The Dual Analog Comparator (ACMP2) module contains two independent analog comparators with all necessary control logic. Each comparator unit compares the analog input volt- ages applied to two input pins and determines which voltage is higher. The CPU uses a memory-mapped register to con- trol the comparator and to obtain the comparison results. The comparison result can also be applied to comparator output pins. 3.18 DEVELOPMENT SUPPORT A powerful cross-development tool set is available from Na- tional Semiconductor and third parties to support the devel- opment and debugging of application software for the CR16MCT9/CR16MCT5/CR16HCT9/CR16HCT5. The tool set lets you program the application software in C and is de- signed to take full advantage of the CompactRISC architec- ture. There are In-System Emulation (ISE) devices available for the device from iSYSTEM™, as well as lower-cost evaluation boards. See your National Semiconductor sales representa- tive for current information on availability and features of em- ulation equipment and evaluation boards. |
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