DS89C420_02 Datasheet, PDF (2/58 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

DS89C420
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
DS89C420-MCL
DS89C420-QCL
DS89C420-ECL
DS89C420-MNL
DS89C420-QNL
DS89C420-ENL
40-Plastic DIP
44-PLCC
44-TQFP
40-Plastic DIP
44-PLCC
44-TQFP
MAX. CLOCK
SPEED (MHz)
33
33
33
33
33
33
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
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