參數(shù)資料
型號(hào)： DS89C420
英文描述： Ultra-High-Speed Microcontroller
中文描述： 超高速微控制器
文件頁(yè)數(shù)： 17/59頁(yè)
文件大?。?/td> 539K
代理商： DS89C420
DS89C420
17 of 59
Table 4. Flash Memory Lock Bits
LEVEL
LB1
LB2
LB3
PROTECTION
1
1
1
1
No program lock. Encrypted verify if encryption array is
programmed.
2
0
1
1
Prevent MOVC in external memory from reading program code in
internal memory.
EA
is sampled and latched on reset. Allow no
further parallel or program memory loader programming.
3
X
0
1
Level 2 plus no verify operation. Also prevent MOVX in external
memory from reading internal SRAM.
4
X
X
0
Level 3 plus no external execution.
The DS89C420 provides user-selectable options that must be set before beginning software execution.
The option control register uses flash bits rather than SFRs, and is individually erasable and
programmable as a byte-wide register. Bit 3 of this register is defined as the watchdog POR default.
Setting this bit to 1 disables the watchdog reset function on power-up, and clearing this bit to 0 enables
the watchdog reset function automatically. Other bits of this register are undefined and are at logic 1
when read. The value of this register can be read at address FCh in parallel programming mode or when
executing a verify-option control-register instruction in ROM loader mode.
The signature bytes can be read in ROM loader mode or in parallel programming mode. Reading data
from addresses 30h, 31h, and 60h provides signature information about manufacturer, part, and extension
as follows:
ADDRESS VALUE
FUNCTION
30h DAh
Manufacturer ID
31h 42h
DS89C420 Device ID
60h 01h
Device Extension
ROM Loader
The full 16kB of 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 up the baud rate generator for communication at that frequency.
When the DS89C420 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. In the ROM loader mode, a mass-erase operation also erases the memory bank select
and sets it to the default state. Otherwise, the memory bank select cannot be altered in the ROM loader
mode.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS89C420_02 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller
DS89C420_05 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller
DS89C420-ECL 功能描述:IC MCU ULTRA 33MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
DS89C420-ECS 功能描述:IC MCU 50MHZ ULTRA HS 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
DS89C420-ENG 功能描述:IC MCU ULTRA 25MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
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