DS80C390-QCR

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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