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| 型號(hào)： | ST10F276Z5Q3 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 64 MHz, RISC MICROCONTROLLER, PQFP144 |
| 封裝： | 28 X 28 MM, 3.40 MM HEIGHT, PLASTIC, QFP-144 |
| 文件頁數(shù)： | 10/239頁 |
| 文件大?。?/td> | 2271K |
| 代理商： | ST10F276Z5Q3 |
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ST10F276Z5
System reset
107/239
19.2
Asynchronous reset
An asynchronous reset is triggered when RSTIN pin is pulled low while RPD pin is at low
level. Then the device is immediately (after the input filter delay) forced in reset default state.
It pulls low RSTOUT pin, it cancels pending internal hold states if any, it aborts all
internal/external bus cycles, it switches buses (data, address and control signals) and I/O
pin drivers to high-impedance, it pulls high Port0 pins.
Note:
If an asynchronous reset occurs during a read or write phase in internal memories, the
content of the memory itself could be corrupted: to avoid this, synchronous reset usage is
strongly recommended.
Power-on reset
The asynchronous reset must be used during the power-on of the device. Depending
on crystal or resonator frequency, the on-chip oscillator needs about 1 to 10 ms to stabilize
(Refer to Electrical Characteristics Section), with an already stable VDD. The logic of the
device does not need a stabilized clock signal to detect an asynchronous reset, so it is
suitable for power-on conditions. To ensure a proper reset sequence, the RSTIN pin and the
RPD pin must be held at low level until the device clock signal is stabilized and the system
configuration value on Port0 is settled.
At Power-on it is important to respect some additional constraints introduced by the start-up
phase of the different embedded modules.
In particular the on-chip voltage regulator needs at least 1 ms to stabilize the internal 1.8 V
for the core logic: this time is computed from when the external reference (VDD) becomes
stable (inside specification range, that is at least 4.5 V). This is a constraint for the
application hardware (external voltage regulator): the RSTIN pin assertion shall be extended
to guarantee the voltage regulator stabilization.
A second constraint is imposed by the embedded FLASH. When booting from internal
memory, starting from RSTIN releasing, it needs a maximum of 1 ms for its initialization:
before that, the internal reset (RST signal) is not released, so the CPU does not start code
execution in internal memory.
Note:
This is not true if external memory is used (pin EA held low during reset phase). In this case,
once RSTIN pin is released, and after few CPU clock (Filter delay plus 3...8 TCL), the
internal reset signal RST is released as well, so the code execution can start immediately
after. Obviously, an eventual access to the data in internal Flash is forbidden before its
initialization phase is completed: an eventual access during starting phase will return FFFFh
(just at the beginning), while later 009Bh (an illegal opcode trap can be generated).
At Power-on, the RSTIN pin shall be tied low for a minimum time that includes also the start-
up time of the main oscillator (tSTUP = 1 ms for resonator, 10 ms for crystal) and PLL
synchronization time (tPSUP = 200s): this means that if the internal FLASH is used, the
RSTIN pin could be released before the main oscillator and PLL are stable to recover some
time in the start-up phase (FLASH initialization only needs stable V18, but does not need
stable system clock since an internal dedicated oscillator is used).
Warning:
It is recommended to provide the external hardware with a
current limitation circuitry. This is necessary to avoid
permanent damages of the device during the power-on
transient, when the capacitance on V18 pin is charged. For
the on-chip voltage regulator functionality 10 nF are
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相關(guān)代理商/技術(shù)參數(shù) |
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| ST10F276Z5Q3TR | 功能描述:16位微控制器 - MCU 16B MCU 832K Byte and 68K Byte RAM RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| ST10F276Z5T3 | 功能描述:16位微控制器 - MCU 16B MCU RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| ST10F280 | 功能描述:16位微控制器 - MCU 16-bit MCU MAC Unit 512 Kb Flash Memory RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| ST10F280_12 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM |
| ST10F280_DATASHEET | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:16-BIT MCU WITH MAC UNIT - 5V SINGLE SUPPLY - 18 KB RAM - 512 KB FLASH MEMORY - 2 TIMERS - A/D - ASC/SSC - 2 CAN2.0B - MARCH 2002 |
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