DS89C420-MNL Maxim Integrated Products, DS89C420-MNL Datasheet - Page 14
DS89C420-MNL
Manufacturer Part Number
DS89C420-MNL
Description
IC MCU ULTRA 33MHZ HP 40-DIP
Manufacturer
Maxim Integrated Products
Series
89Cr
Datasheet
1.DS89C420-QCS.pdf
(47 pages)
Specifications of DS89C420-MNL
Core Processor
8051
Core Size
8-Bit
Speed
33MHz
Connectivity
EBI/EMI, SIO, UART/USART
Peripherals
Power-Fail Reset, WDT
Number Of I /o
32
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Available stocks
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Figure 5. Block Diagram
DETAILED DESCRIPTION
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, brownout 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.
Dallas Semiconductor
Control &
Sequencer
Watchdog Timer
Power Manager
Decoder
DS89C420
IR
&
Internal Control Bus
Serial I/O
Internal
Registers
Clock &
Timer /
Counters
Reset
14 of 47
Interrupt
CPU
1Kx 8
RAM
Memory
Control
DPTR1
16K x 8
SFRs
DPTR
Loader
Flash
ROM
SP
P0 P1 P2 P3
AR Inc
I/O Ports
Address Bus
PC
AR