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参数资料
| 型号： | ST52F514G3B6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 47/106页 |
| 文件大小： | 1340K |
| 代理商： | ST52F514G3B6 |
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6.2 Reset
Four Reset sources are available:
s
RESET pin (external source)
s
WATCHDOG (internal source)
s
POWER ON Reset (Internal source)
s
PLVD Reset (Internal source)
When a Reset event occurs, the user program
restarts from the beginning.
6.2.1 External Reset. Reset is an input pin. An
internal reset does not affect this pin. A Reset
signal
originated
by
external
sources
is
recognized immediately. The RESET pin may be
used to ensure Vdd has risen to a point where the
ICU can operate correctly before the user program
is run. Reset must be set to Vdd in working mode.
A Pull up resistor of 100 K
guarantees that the
RESET pin is at level “1” when no HALT or Power-
On events occur. If an external resistor is
connected to the RESET pin a minimum value of
10K
must be used.
6.2.2 Reset Procedures. After the Reset pin is
set to Vdd or following a Power-On Reset event,
the device is not started until the internal supply
voltage has reached the nominal level of 2.5 V
(corresponding roughly to Vdd=2.8 V).
Figure 6.2 Reset Block Diagram
After this level has been
reached, the internal
oscillator (10 MHZ) is started and a delay period of
4.096 clock cycles is initiated, in order to allow the
oscillator to stabilize and to ensure that recovery
has taken place from the Reset state.
If the device has been configured to work with the
internal clock, the user program starts, otherwise
the Option Byte 7 (WAKEUP) is read and another
count starts before running the user program. The
duration of the count depends on the contents of
the Option Byte 7 (WAKEUP), that works as a
prescaler, according to the follwing formula:
This delay has been introduced in order to ensure
that the oscillator has become stable after its
restart.
If the Reset is generated by the PLVD or the
Watchdog, the oscillator is not turned off; for this
reason the CPU is then restarted immediately,
without the delay.
After a RESET procedure is completed, the core
reads the instruction stored in the first 3 bytes of
the Program/Data Memory, which contains a
JUMP instruction to the first instruction of the user
program.
The
Assembler
tool
automatically
generates this Jump instruction with the first
instruction address.
POWER-ON
RESET
Vdd
RESET
4096 x TCLK
INTERNAL RESET
WATCHDOG RESET
(W AKEUP+1) x
4096 x TCLK
W ATCHDOG
PROGRAMMABLE LOW VOLTAGE DETECTOR RESET
PLVD
CKMOD1:0
INTERNAL CLOCK SOURCES
EXTERNAL CLOCK
TCLK = Internal Clock period (100 ns)
CKMOD1:0 = see Option Byte 0 (OSC_CR)
W AKEUP = see Option Byte 7 (W AKEUP)
Delay
4096
WAKEUP
1
+
() Tclk
×
=
相关PDF资料 |
PDF描述 |
|---|---|
| ST52F513G3B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP28 |
| ST52F513Y1B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP16 |
| ST52F513Y2B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP16 |
| ST52F510Y3B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP16 |
| ST52F514Y2B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST52F514G3M6 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| ST52F514GMB6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F514GMM6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F514Y0B6 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| ST52F514Y0M6 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
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