參數(shù)資料
型號(hào)： DS89C440-QNL
英文描述： Ultra-High-Speed Flash Microcontrollers
中文描述： 超高速閃存微控制器
文件頁數(shù)： 25/48頁
文件大小： 656K
代理商： DS89C440-QNL
DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
25 of 48
ROM Loader
The full on-chip flash program memory space, security flash block, and external SRAM can be programmed in-
system from an external source through serial port 0 under the control of a built-in ROM loader. The ROM loader
also has an auto-baud feature that determines which baud-rate frequencies are being used for communication and
sets the baud-rate generator for that speed.
When the DS89C430 is powered up and has entered its user operating mode, the ROM loader mode can be
invoked at any time by forcing RST = 1,
EA
= 0, and
PSEN
= 0. It remains in effect until power-down or when the
condition (RST = 1 and
PSEN
=
EA
= 0) is removed. Entering the ROM loader mode forces the processor to start
fetching from the 2kB internal ROM for program memory initialization and other loader functions.
The read/write accessibility is determined by the state of the lock bits, which can be verified directly by the ROM
loader.
The flash memory can be programmed (by the built-in ROM loader) using commands that are received over the
serial interface from a host PC. Full details of the ROM loader commands are given in the
Ultra-High-Speed Flash
Microcontroller User’s Guide
format
for more
相關(guān)PDF資料
PDF描述
DS89C450-ENL Ultra-High-Speed Flash Microcontrollers
DS89C450-MNL Ultra-High-Speed Flash Microcontrollers
DS89C450-QNL Ultra-High-Speed Flash Microcontrollers
DS89C430-DS89C450 Ultra-High-Speed Flash Microcontrollers
DS89C450 RES,Wirewound,301Ohms,1+/-% Tol,-20,20ppm-TC,4427-Case
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS89C440-QNL+ 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C440-XXX 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C450 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C450+ENG 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays
DS89C450+ENL 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays
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