參數(shù)資料
型號(hào): MC9S08RE16
廠(chǎng)商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: 8 bit Microcontroller Unit (MCU)(8位MCU)
中文描述: 8位微控制器(MCU)(8位微控制器)
文件頁(yè)數(shù): 58/232頁(yè)
文件大?。?/td> 1044K
代理商: MC9S08RE16
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Resets, Interrupts, and System Configuration
MC9S08RC/RD/RE/RG
58
Freescale Semiconductor
5.3 MCU Reset
Resetting the MCU provides a way to start processing from a known set of initial conditions. During reset,
most control and status registers are forced to initial values and the program counter is loaded from the
resetvector($FFFE:$FFFF).On-chipperipheralmodulesaredisabledandI/Opinsareinitiallyconfigured
as general-purpose high-impedance inputs with pullup devices disabled. The I bit in the condition code
register(CCR)issettoblockmaskableinterruptsuntiltheuserprogramhasachancetoinitializethestack
pointer (SP) and system control settings. SP is forced to $00FF at reset.
The MC9S08RC/RD/RE/RG has six sources for reset:
Power-on reset (POR)
Low-voltage detect (LVD)
Computer operating properly (COP) timer
Illegal opcode detect
Illegal address (16K and 8K devices only)
Background debug forced reset
The reset pin (RESET)
Each of these sources, with the exception of the background debug forced reset, has an associated bit in
the system reset status register. Whenever the MCU enters reset, the reset pin is driven low for 34 internal
bus cycles where the internal bus frequency is one-half the OSC frequency. After the 34 cycles are
completed, the pin is released and will be pulled up by the internal pullup resistor, unless it is held low
externally. After the pin is released, it is sampled after another 38 cycles to determine whether the reset
pin is the cause of the MCU reset.
5.4 Computer Operating Properly (COP) Watchdog
The COP watchdog is intended to force a system reset when the application software fails to execute as
expected. To prevent a system reset from the COP timer (when it is enabled), application software must
reset the COP timer periodically. If the application program gets lost and fails to reset the COP before it
times out, a system reset is generated to force the system back to a known starting point. The COP
watchdog is enabled by the COPE bit in SOPT (see
5.8.4 System Options Register (SOPT)
for additional
information).TheCOPtimerisresetbywritinganyvaluetotheaddressofSRS.Thiswritedoesnotaffect
the data in the read-only SRS. Instead, the act of writing to this address is decoded and sends a reset signal
to the COP timer.
After any reset, the COP timer is enabled. This provides a reliable way to detect code that is not executing
as intended. If the COP watchdog is not used in an application, it can be disabled by clearing the COPE
bit in the write-once SOPT register. Also, the COPT bit can be used to choose one of two timeout periods
(2
18
or 2
20
cycles of the bus rate clock). Even if the application will use the reset default settings in COPE
and COPT, the user must write to write-once SOPT during reset initialization to lock in the settings. That
way, they cannot be changed accidentally if the application program gets lost.
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參數(shù)描述
MC9S08RE16CDWE 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC9S08RE16CFDE 功能描述:IC MCU 16K FLASH 1K RAM 48-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:S08 標(biāo)準(zhǔn)包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:8KB(8K x 8) 程序存儲(chǔ)器類(lèi)型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱(chēng):864285
MC9S08RE16CFDER 功能描述:8位微控制器 -MCU 8 BIT 16K FLASH 1K RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
MC9S08RE16CFG 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC9S08RE16CFGE 功能描述:IC MCU 16K FLASH 8MHZ 44-LQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:S08 標(biāo)準(zhǔn)包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:8KB(8K x 8) 程序存儲(chǔ)器類(lèi)型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱(chēng):864285