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DS89C420-ENL Datasheet(PDF) 2 Page - Maxim Integrated Products |
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DS89C420-ENL Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 58 page DS89C420 2 of 58 DESCRIPTION The DS89C420 offers the highest performance available in 8051-compatible microcontrollers. It features a redesigned processor core that executes every 8051 instruction (depending on the instruction type) up to 12 times faster than the original for the same crystal speed. Typical applications see a speed improve ment of 10 times using the same code and crystal. The DS89C420 offers a maximum crystal speed of 33MHz, achieving execution rates up to 33 million instructions per second (MIPS). The DS89C420 is pin compatible with all three packages of the standard 8051 and includes standard resources such as three timer/counters, four 8-bit I/O ports, and a serial port. It features 16kB of in-system programmable flash memory, which can be programmed in-system from an I/O port using a built- in program memory loader. It can also be loaded externally using standard commercially available programmers. Besides greater speed, the DS89C420 includes 1kB of data RAM, a second full- hardware serial port, seven additional interrupts, two more levels of interrupt priority, programmable watchdog timer, brown- out monitor, and power- fail reset. The device also provides dual data pointers (DPTRs) to speed up block-data memory moves. This feature is further enhanced with a new selectable automatic increment/decrement and toggle-select operation. The speed of MOVX data memory access can be adjusted by adding stretch values up to 10 machine cycle times for flexibility in selecting external memory and peripherals. A power management mode (PMM) significantly consumes less power by slowing the CPU execution rate from 1 clock period per cycle to 1024 clock periods per cycle. A selectable switchback feature can automatically cancel this mode to enable a normal speed response to interrupts. The EMI reduction feature disables the ALE signal when the processor is not accessing external memory. ORDERING INFORMATION PART PIN-PACKAGE MAX. CLOCK SPEED (MHz) TEMP. RANGE DS89C420-MCL 40-Plastic DIP 33 0°C to +70°C DS89C420-QCL 44-PLCC 33 0°C to +70°C DS89C420-ECL 44-TQFP 33 0°C to +70°C DS89C420-MNL 40-Plastic DIP 33 -40°C to +85°C DS89C420-QNL 44-PLCC 33 -40°C to +85°C DS89C420-ENL 44-TQFP 33 -40°C to +85°C |
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