DS89C430 datasheet(14/48 Pages) DALLAS

14 / 48 page

DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers

14 of 48

Figure 5. Functional Diagram

CONTROL

AND

SEQUENCER

INTERNAL

REGISTERS

DECODER

INTERRUPT

CPU

SERIAL I/O

TIMER/

COUNTERS

1kB x 8

RAM

16kB/32kB

64kB x 8

FLASH

I/O PORTS

SFRs

DPTR

DPTR1

AR INC

WATCHDOG TIMER

AND

POWER MANAGER

CLOCK

AND

RESET

MEMORY

CONTROL

ROM

LOADER

P0 P1 P2 P3

ADDRESS BUS

INTERNAL CONTROL BUS

DETAILED DESCRIPTION

The DS89C430, DS89C440, and DS89C450 are pin compatible with all three packages of the standard 8051 and

include standard resources such as three timer/counters, serial port, and four 8-bit I/O ports. The three part

numbers vary only by the amount of internal flash memory (DS89C430 = 16kB, DS89C440 = 32kB, DS89C450 =

64kB), which can be in-system/in-application programmed from a serial port using ROM-resident or user-defined

loader software. For volume deployments, the flash can also be loaded externally using standard commercially

available parallel programmers.

Besides greater speed, the DS89C430/DS89C440/DS89C450 include 1kB of data RAM, a second full hardware

serial port, seven additional interrupts, two extra levels of interrupt priority, programmable watchdog timer,

brownout monitor, and power-fail reset. Dual data pointers (DPTRs) are included to speed up block data-memory

moves with further enhancements coming from 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

cycles for flexibility in selecting external memory and peripherals.

A power management mode consumes significantly lower power by slowing the CPU execution rate from one clock

period per cycle to 1024 clock periods per cycle. A selectable switchback feature can automatically cancel this

mode to enable normal speed responses to interrupts.

For EMI-sensitive applications, the microcontroller can disable the ALE signal when the processor is not accessing

external memory.

Dallas Semiconductor

DS89C430/DS89C440/

DS89C450

DS89C430 датащи(PDF) 14 Page - Dallas Semiconductor

DS89C430 датащи(HTML) 14 Page - Dallas Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

датащи скачать

ссылки URL