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參數(shù)資料

2011 Silicon Storage Technology, Inc.

DS25087A

10/11

FlashFlex MCU

SST89V54RD2/RD / SST89V58RD2/RD

Not Recommended for New Designs

A Microchip Technology Company

Software Reset

The software reset is executed by changing SFCF[1] (SWR) from “0” to “1”. A software reset will reset

the program counter to address 0000H. All SFR registers will be set to their reset values, except

SFCF[1] (SWR), WDTC[2] (WDTS), and RAM data will not be altered.

Brown-out Detection Reset

The device includes a brown-out detection circuit to protect the system from severed supplied voltage

VDD fluctuations. The SST89V5xRD2/RD brown-out detection threshold is 2.35V. For brown-out volt-

age parameters, please refer to Tables 35.

When VDD drops below this voltage threshold, the brown-out detector triggers the circuit to generate a

brown-out interrupt but the CPU still runs until the supplied voltage returns to the brown-out detection

voltage VBOD. The default operation for a brown-out detection is to cause a processor reset.

VDD must stay below VBOD at least four oscillator clock periods before the brown-out detection circuit

will respond.

Brown-out interrupt can be enabled by setting the EBO bit in IEA register (address E8H, bit 3). If EBO

bit is set and a brown-out condition occurs, a brown-out interrupt will be generated to execute the pro-

gram at location 004BH. It is required that the EBO bit be cleared by software after the brown-out inter-

rupt is serviced. Clearing EBO bit when the brown-out condition is active will properly reset the device.

If brown-out interrupt is not enabled, a brown-out condition will reset the program to resume execution

at location 0000H.

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
SST89V54RD2-33-C-TQJ-E	功能描述:8位微控制器 -MCU 24K(16Kx8K) 33nS RoHS:否制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
SST89V54RD2-33-C-TQJE1	制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V54RD2-33-C-TQJF2	制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V54RD2-33-I-NI	制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V54RD2-33-I-NIE1	制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU

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