DS87C520-QCL

DESCRIPTION

The DS87C520/DS83C520 EPROM/ROM High-Speed Micro is a fast 8051-compatible microcontroller. It features a redesigned processor core without wasted clock and memory cycles. As a result, it executes every 8051 instruction between 1.5 and 3 times faster than the original for the same crystal speed. Typical applications will see a speed improvement of 2.5 times using the same code and the same crystal. The DS87C520/DS83C520 offers a maximum crystal speed of 33 MHz, resulting in apparent execution speeds of 82.5 MHz (approximately 2.5X).

FEATURES

■ 80C52-compatible
- 8051 pin and instruction set compatible
- Four 8-bit I/O ports
- Three 16-bit timer/counters
- 256 bytes scratchpad RAM
■ Large on-chip memory
- 16kB program memory
- 1kB extra on-chip SRAM for MOVX
■ ROMSIZE feature
- Selects internal ROM size from 0 to 16kB
- Allows access to entire external memory map
- Dynamically adjustable by software
- Useful as boot block for external FLASH
■ High-speed architecture
- 4 clocks/machine cycle (8051 = 12)
- Runs DC to 33MHz clock rates
- Single-cycle instruction in 121ns
- Dual data pointer
- Optional variable length MOVX to access fast/slow RAM/peripherals
■ Power Management Mode
- Programmable clock source to save power
- CPU runs from (crystal/64) or (crystal/1024)
- Provides automatic hardware and software exit
■ EMI Reduction Mode disables ALE
■ Two full-duplex hardware serial ports
■ High integration controller includes:
- Power-Fail Reset
- Early-Warning Power-Fail Interrupt
- Programmable Watchdog Timer
■ 13 total interrupt sources with 6 external
■ Available in 40-pin PDIP, 44-pin PLCC, 44-pin TQFP, and 40-pin windowed CERDIP
■ Factory Mask DS83C520 or EPROM (OTP) DS87C520