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參數(shù)資料
| 型號： | SST89C58-33-I-TQJE |
| 廠商： | SILICON STORAGE TECHNOLOGY INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | LEAD FREE, TQFP-44 |
| 文件頁數(shù)： | 26/52頁 |
| 文件大?。?/td> | 967K |
| 代理商： | SST89C58-33-I-TQJE |
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32
Data Sheet
FlashFlex51 MCU
SST89C54 / SST89C58
2004 Silicon Storage Technology, Inc.
S71131-04-000
6/04
9.0 RESET
A system reset initializes the MCU and begins program
execution at program memory location 0000H. The reset
input for the SST89C54/58 is the RST pin. In order to reset
the device, a logic level high must be applied to the RST pin
for at least two machine cycles (24 clocks), after the oscilla-
tor becomes stable. ALE and PSEN# are weakly pulled
high during reset. During reset, ALE and PSEN# output a
high level in order to perform correct reset. This level must
not be affected by external element. A system reset will not
affect the 256 Bytes of on-chip RAM while the SST89C54/
58 is running, however, the contents of the on-chip RAM
during power up are indeterminate. All Special Function
Registers (SFR) return to their reset values, which are out-
9.1 Power-On Reset
At initial power up, the port pins will be in a random state
until the oscillator has started and the internal reset algo-
rithm has weakly pulled all pins high. Powering up the
device without a valid reset could cause the CPU to
start executing instructions from an indeterminate
location. Such undefined states may inadvertently cor-
rupt the code in the flash.
When power is applied to the SST89C54/58, the RST pin
must be high long enough for the oscillator to start up (usu-
ally several milliseconds for a low frequency crystal), in
addition to two machine cycles for a valid Power-On Reset.
An example of a method to extend the RST signal is to
implement a RC circuit by connecting the RST pin to VDD
through a 10F capacitor and to VSS through an 8.2 KOhm
resistor as shown in Figure 10-1. Note that if an RC circuit
is being used, provisions should be made to ensure the
VDD rise time does not exceed 10 ms. The oscillator start-
up time depends on the crystal frequency.
For a low frequency oscillator with slow start-up time the
reset signal must be extended in order to account for the
slow start-up time. This method maintains the necessary
relationship between VDD and RST to avoid programming
at an indeterminate location, which may cause corruption
in the flash memory.
Crystal
Typical Start-up Time
10MHz
1ms
1MHz
10ms
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| SST89C58RC-40-I-QIF | 功能描述:8位微控制器 -MCU 40K (32Kx8K) SM-Bus 40MHz 2.7-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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 安裝風格:SMD/SMT |
| SST89C58RC-40-I-TQJE | 功能描述:8位微控制器 -MCU 40K (32Kx8K) SM-Bus 40MHz 2.7-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據 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 安裝風格:SMD/SMT |
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