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| 型號(hào)： | MC68331CFV16 |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | User’s Manual |
| 中文描述： | 32-BIT, 16.78 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | QFP-144 |
| 文件頁(yè)數(shù)： | 85/254頁(yè) |
| 文件大小： | 1354K |
| 代理商： | MC68331CFV16 |
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MC68331
USER’S MANUAL
SYSTEM INTEGRATION MODULE
MOTOROLA
4-43
4
If an internal source asserts a reset signal, the reset control logic asserts RESET for
a minimum of 512 cycles. If the reset signal is still asserted at the end of 512 cycles,
the control logic continues to assert RESET until the internal reset signal is negated.
After 512 cycles have elapsed, the reset input pin goes to an inactive, high-impedance
state for ten cycles. At the end of this 10-cycle period, the reset input is tested. When
the input is at logic level one, reset exception processing begins. If, however, the reset
input is at logic level zero, the reset control logic drives the pin low for another 512 cy-
cles. At the end of this period, the pin again goes to high-impedance state for ten cy-
cles, then it is tested again. The process repeats until RESET is released.
4.6.7 Power-On Reset
When the SIM clock synthesizer is used to generate system clocks, power-on reset in-
volves special circumstances related to application of system and clock synthesizer
power. Regardless of clock source, voltage must be applied to clock synthesizer pow-
er input pin V
DDSYN
for the MCU to operate. The following discussion assumes that
V
DDSYN
is applied before and during reset, which minimizes crystal start-up time.
When V
DDSYN
is applied at power-on, start-up time is affected by specific crystal pa-
rameters and by oscillator circuit design. V
DD
ramp-up time also affects pin state dur-
ing reset. Refer to
APPENDIX A ELECTRICAL CHARACTERISTICS
for voltage and
timing specifications.
During power-on reset, an internal circuit in the SIM drives the IMB internal (MSTRST)
and external (EXTRST) reset lines. The circuit releases MSTRST as V
DD
ramps up to
the minimum specified value, and SIM pins are initialized as shown in
Table 4-19
. As
V
DD
reaches specified minimum value, the clock synthesizer VCO begins operation
and clock frequency ramps up to specified limp mode frequency. The external RESET
line remains asserted until the clock synthesizer PLL locks and 512 CLKOUT cycles
elapse line remains asserted until the clock synthesizer PLL locks and 512 CLKOUT
cycles elapse.
The SIM clock synthesizer provides clock signals to the other MCU modules. After the
clock is running and MSTRST is asserted for at least four clock cycles, these modules
reset. V
DD
ramp time and VCO frequency ramp time determine how long the four cy-
cles take. Worst case is approximately 15 milliseconds. During this period, module
port pins may be in an indeterminate state. While input-only pins can be put in a known
state by external pull-up resistors, external logic on input/output or output-only pins
during this time must condition the lines. Active drivers require high-impedance buffers
or isolation resistors to prevent conflict.
Figure 4-16
is a timing diagram of power-up reset. It shows the relationships between
RESET, V
DD
, and bus signals.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68331CFV20 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:User’s Manual |
| MC68331CPV16 | 功能描述:IC MCU 32BIT 16MHZ 144-LQFP RoHS:否 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:M683xx 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類(lèi)型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤(pán) 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱(chēng):497-9032STM32F101T8U6-ND |
| MC68331CPV16B1 | 制造商:Rochester Electronics LLC 功能描述:32BIT MCU,GPT,SIM,QSM - Bulk |
| MC68331CPV20 | 制造商:Rochester Electronics LLC 功能描述:32BIT MCU,GPT,SIM,QSM - Bulk |
| MC68331CPV20B1 | 制造商:Rochester Electronics LLC 功能描述:32BIT MCU,GPT,SIM,QSM - Bulk |
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