SX20AC Datasheet | Ubicom

March, 2002 SX20AC/SX28AC Configurable munications Controllers with EE/Flash Program Memory, In-System Programming Capability and On-Chip Debug PRODUCT OVERVIEW Introduction enables the device to implement hard real-time functions as software modules (Virtual Peripheral™) to replace traditional hardware functions. On-chip functions include a general-purpose 8-bit timer with prescaler, an analog parator, a brown-out detector, a watchdog timer, a power-save mode with multisource wakeup capability, an internal R/C oscillator, userselectable clock modes, and high-current outputs. The Ubi .. SX family of configurable munications controllers are fabricated in an advanced CMOS process technology. The advanced process, bined with a RISC-based architecture, allows high-speed putation, flexible I/O control, and efficient data manipulation. Throughput is enhanced by operating the device at frequencies up to 75 MHz and by optimizing the instruction set to include mostly single-cycle instructions. In addition, the SX architecture is deterministic and totally reprogramable. The unique bination of these characteristics OSC1 OSC2 RTCC OSC 8-bit Watchdog 8-bit Timer Driver Clock RTCC Timer (WDT) Select 4MHz Internal ÷ 4 or ÷ 1 RC OSC Interrupt Stack System Clock 8 MCLR Prescaler for RTCC Power-On Analog 3 or Reset Interrupt RESET MIWU Port B p Prescaler for WDT Brown-Out 8 8 8 MIWU System Clock Internal Data Bus 8 8 8 8 8 8 8 8 In-System W PC Debugging 3 Level 8 Port A Port C ALU FSR Address Stack Fetch In-System 4 8 Instruction PC Programming Decode Pipeline 136 Bytes STATUS SRAM Executive 2k Words Address 12 EEPROM OPTION Write Back MODE 8 Write Data Read Data 8 Instruction 12 IREAD Figure 1-1. Block Diagram Ubi™ and the Ubi logo are trademarks of Ubi, Inc. I2C™ is a trademark of Philips Corporation All other trademarks mentioned in this document are property of their respective panies. © 2002 Ubi, Inc....