參數(shù)資料
型號: SST89V54RD2-33-C-NJE
廠商: Microchip Technology
文件頁數(shù): 66/92頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 24KB FLASH 44PLCC
標準包裝: 26
系列: FlashFlex®
核心處理器: 8051
芯體尺寸: 8-位
速度: 33MHz
連通性: EBI/EMI,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,WDT
輸入/輸出數(shù): 36
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 8K x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 44-LCC
包裝: 管件
2011 Silicon Storage Technology, Inc.
DS25087A
10/11
69
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.
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