[Scenix Semiconductor, Inc.]

 Introduction
The Scenix SX family of configurable communications controllers are fabricated in an advanced CMOS process technology. The advanced process, combined with a RISC-based architecture, allows high-speed computation, flexible I/O control, and efficient data manipulation.

KEY FEATUREs
50 MIPS Performance
• SX18AC/SX20AC/SX28AC: DC - 50 MHz operation
    SX18AC75/SX20AC75/SX28AC75: DC - 75 MHz
• SX18AC/SX20AC/SX28AC: 20 ns instruction cycle, 60 ns internal interrupt response
    SX18AC75/SX20AC75/SX28AC75: 13.3 ns instruction cycle, 39.9 ns internal interrupt response
• 1 instruction per clock (branches 3)

EE/FLASH Program Memory and SRAM Data Memory
• Access time of < 10 ns provides single cycle access
• EE/Flash rated for > 10,000 rewrite cycles
• 2048 Words EE/Flash program memory
• 136x8 bits SRAM data memory

CPU Features
• Compact instruction set
• All instructions are single cycle except branch
• Eight-level push/pop hardware stack for subroutine linkage
• Fast table lookup capability through run-time readable code (IREAD instruction)
• Totally predictable program execution flow for hard real-time applications

Fast and Deterministic Interrupt
• Jitter-free 3-cycle internal interrupt response
• Hardware context save/restore of key resources such as PC, W, STATUS, and FSR within the 3-cycle interrupt response time
• External wakeup/interrupt capability on Port B (8 pins)

Flexible I/O
• All pins individually programmable as I/O
• Inputs are TTL or CMOS level selectable
• All pins have selectable internal pull-ups
• Selectable Schmitt Trigger inputs on Ports B, and C
• All outputs capable of sourcing/sinking 30 mA
• Port A outputs have symmetrical drive
• Analog comparator support on Port B (RB0 OUT, RB1 IN-, RB2 IN+)
• Selectable I/O operation synchronous to the oscillator clock

Hardware Peripheral Features
• One 8-bit Real Time Clock/Counter (RTCC) with programable 8-bit prescaler
• Watchdog Timer (shares the RTCC prescaler)
• Analog comparator
• Brown-out detector
• Multi-Input Wakeup logic on 8 pins
• Internal RC oscillator with configurable rate from 31.25 kHz to 4 MHz
• Power-On-Reset

Packages
• 18-pin SOP/DIP, 20-pin SSOP, 28-pin SOP/DIP/SSOP

Programming and Debugging Support
• On- chip in-system programming support with serial and parallel interfaces
• In-system serial programming via oscillator pins
• On-chip in-System debugging support logic
• Real-time emulation, full program debug, and integrated development environment offered by third party tool vendors