DESCRIPTION
The DS80C390 is a fast 8051-compatible microprocessor. The redesigned processor core executes 8051 instructions up to 3 times faster than the original for the same crystal speed. The DS80C390 supports a maximum crystal speed of 40 MHz, resulting in apparent execution speeds of 100 MHz (approximately 2.5X). An optional internal frequency multiplier allows the microprocessor to operate at full speed with a reduced crystal frequency, reducing EMI. A hardware math accelerator further increases the speed of 32 and 16 bit multiply and divide operations, as well as high-speed shift, normalization and accumulate functions.

FEATURES
■ 80C52 compatible
    - 8051 instruction-set compatible
    - Four 8-bit I/O ports
    - Three 16-bit timer/counters
    - 256 bytes scratchpad RAM
■ High-Speed Architecture
    - 4 clocks/machine cycle (8051=12)
    - Runs DC to 40 MHz clock rates
    - Frequency multiplier reduces EMI
    - Single-cycle instruction in 100 ns
    - 16/32-bit math coprocessor
■ 4 kB internal SRAM usable as program/data/stack memory
■ Enhanced memory architecture
    - Addresses up to 4 MB external
    - Defaults to true 8051 memory compatibility
    - User-enabled 22-bit program/data counter
    - 16-Bit/22-bit paged/22-bit contiguous modes
    - User-selectable multiplexed / nonmultiplexed memory interface
    - Optional 10 bit stack pointer
■ Two full-function CAN 2.0B controllers
    - 15 message centers per controller
    - Standard 11-bit or extended 29-bit identification modes
    - Supports DeviceNet, SDS, and higher layer CAN protocols
    - Disables transmitter during autobaud
    - SIESTA low power mode
■ Two full-duplex hardware serial ports
■ Programmable IrDA clock
■ High integration controller includes
    - Power-fail reset
    - Early-warning power-fail interrupt
    - Programmable watchdog timer
    - Oscillator-fail detection
■ 16 total interrupt sources with 6 external
■ Available in 64-pin QFP, 68-pin PLCC
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