參數(shù)資料
型號： ST72C254G2M1
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
中文描述： 8位單電壓閃存微控制器。 ADC的。 16位定時器。的SPI。
文件頁數(shù)： 54/140頁
文件大?。?/td> 1349K
代理商： ST72C254G2M1
ST72104G, ST72215G, ST72216G, ST72254G
20/140
RESET SEQUENCE MANAGER (Cont’d)
7.2.2 Asynchronous External RESET pin
The RESET pin is both an input and an open-drain
output with integrated RON weak pull-up resistor.
This pull-up has no fixed value but varies in ac-
cordance with the input voltage. It can be pulled
low by external circuitry to reset the device. See
electrical characteristics section for more details.
A RESET signal originating from an external
source must have a duration of at least th(RSTL)in in
order to be recognized. This detection is asynchro-
nous and therefore the MCU can enter reset state
even in HALT mode.
The RESET pin is an asynchronous signal which
plays a major role in EMS performance. In a noisy
environment, it is recommended to follow the
guidelines mentioned in the electrical characteris-
tics section.
Two RESET sequences can be associated with
this RESET source: short or long external reset
pulse (see Figure 12).
Starting from the external RESET pulse recogni-
tion, the device RESET pin acts as an output that
is pulled low during at least tw(RSTL)out.
7.2.3 Internal Low Voltage Detection RESET
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
s
Power-On RESET
s
Voltage Drop RESET
The device RESET pin acts as an output that is
pulled low when VDD<VIT+ (rising edge) or
VDD<VIT- (falling edge) as shown in Figure 12.
The LVD filters spikes on VDD larger than tg(VDD) to
avoid parasitic resets.
7.2.4 Internal Watchdog RESET
The RESET sequence generated by a internal
Watchdog counter overflow is shown in Figure 12.
Starting from the Watchdog counter underflow, the
device RESET pin acts as an output that is pulled
low during at least tw(RSTL)out.
Figure 12. RESET Sequences
VDD
RUN
RESET PIN
EXTERNAL
WATCHDOG
DELAY
VIT+
VIT-
th(RSTL)in
tw(RSTL)out
RUN
DELAY
th(RSTL)in
DELAY
WATCHDOG UNDERFLOW
tw(RSTL)out
RUN
DELAY
RUN
RESET
SOURCE
SHORT EXT.
RESET
LVD
RESET
LONG EXT.
RESET
WATCHDOG
RESET
INTERNAL RESET (4096 TCPU)
FETCH VECTOR
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72C254G2M3 功能描述:8位微控制器 -MCU ST72104G ST72215G ST72254G 8B MCU 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
ST72C254G2M3/TR 功能描述:8位微控制器 -MCU 8B MCU SINGLE VLTG FLASH MEMORY 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
ST72C254G2M6 功能描述:8位微控制器 -MCU Flash 8K SPI/I2C 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
ST72C254G2M6 制造商:STMicroelectronics 功能描述:8BIT MCU FLASH 8K 72C254 SOIC28
ST72C254G2M6/TR 制造商:ST 功能描述:0
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