- 您现在的位置：买卖IC网 > PDF目录372305 > ST62E40BG1 8-BIT MICROCONTROLLER PDF资料下载
参数资料
| 型号： | ST62E40BG1 |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件页数： | 20/74页 |
| 文件大小： | 733K |
| 代理商： | ST62E40BG1 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页
20/74
ST62T46B/E46B
3.2 RESETS
The MCU can be reset in three ways:
– by the external Reset input being pulled low;
– by Power-on Reset;
– by the digital Watchdog peripheral timing out.
3.2.1 RESET Input
The RESET pin may be connected to a device of
the application board in order to reset the MCU if
required. The RESET pin may be pulled low in
RUN, WAIT or STOP mode. This input can be
used to reset the MCU internal state and ensure a
correct start-up procedure. The pin is active low
and features a Schmitt trigger input. The internal
Reset signal is generated by adding a delay to the
external signal. Therefore even short pulses on
the RESET pin are acceptable, provided V
DD
has
completed its rising phase and that the oscillator is
running correctly (normal RUN or WAIT modes).
The MCU is kept in the Reset state as long as the
RESET pin is held low.
If RESET activation occurs in the RUN or WAIT
modes, processing of the user program is stopped
(RUN mode only), the Inputs and Outputs are con-
figured as inputs with pull-up resistors and the
main Oscillator is restarted. When the level on the
RESET pin then goes high, the initialization se-
quence is executed following expiry of the internal
delay period.
If RESET pin activation occurs in the STOP mode,
the oscillator starts up and all Inputs and Outputs
are configured as inputs with pull-up resistors.
When the level of the RESET pin then goes high,
the initialization sequence is executed following
expiry of the internal delay period.
3.2.2 Power-on Reset
The function of the POR circuit consists in waking
up the MCU at an appropriate stage during the
power-on sequence. At the beginning of this se-
quence, the MCU is configured in the Reset state:
all I/O ports are configured as inputs with pull-up
resistors and no instruction is executed. When the
power supply voltage rises to a sufficient level, the
oscillator starts to operate, whereupon an internal
delay is initiated, in order to allow the oscillator to
fully stabilize before executing the first instruction.
The initialization sequence is executed immediate-
ly following the internal delay.
The internal delay is generated by an on-chip coun-
ter. The internal reset line is released 2048 internal
clock cycles after release of the external reset.
Notes:
To ensure correct start-up, the user should take
care that the reset signal is not released before the
V
DD
level is sufficient to allow MCU operation at
the chosen frequency (see Recommended Oper-
ating Conditions).
A proper reset signal for a slow rising V
DD
supply
can generally be provided by an external RC net-
work connected to the RESET pin.
Figure 11. Reset and Interrupt Processing
INNMI MASK SET
( IF PRESENT )
RESET
SELECT
NMI MODE FLAGS
IS RESET STILL
PRESENT
YES
PUT FFEH
ON ADDRESS BUS
FROM RESET LOCATIONS
FFE/FFF
NO
FETCH INSTRUCTION
LOAD PC
VA000427
相关PDF资料 |
PDF描述 |
|---|---|
| ST62T45BQ6 | 8-BIT MICROCONTROLLER |
| ST6242B | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. LCD DRIVER. EEPROM. A/D CONVERTER AND 64 PINS |
| ST62E45BG1 | 8-BIT MICROCONTROLLER |
| ST62T40BQ6 | 8-BIT MICROCONTROLLER |
| ST62T42BQ6 | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. LCD DRIVER. EEPROM. A/D CONVERTER AND 64 PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST62E40C | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:GANG PROGRAMMERS FOR ST62 MCU FAMILY |
| ST62E40G1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST62E42 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:GANG PROGRAMMERS FOR ST62 MCU FAMILY |
| ST62E42B | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER |
| ST62E42BG1 | 功能描述:8位微控制器 -MCU UV EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。