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參數(shù)資料
| 型號(hào)： | MC68HC705BD3 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 33/112頁 |
| 文件大小： | 676K |
| 代理商： | MC68HC705BD3 |
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MC68HC05BD3
MOTOROLA
4-1
RESETS AND INTERRUPTS
4
4
RESETS AND INTERRUPTS
4.1
RESETS
The MC68HC05BD3 can be reset in four ways: by the initial power-on reset function, by an active
low input to the RESET pin, by an opcode fetch from an illegal address, and by a COP watchdog
timer reset. Any of these resets will cause the program to go to its starting address, specified by
the contents of memory locations $3FFE and $3FFF, and cause the interrupt mask of the
Condition Code register to be set.
4.1.1
Power-On Reset (POR)
The power-on reset occurs when a positive transition is detected on the supply voltage, V
DD
. The
power-on reset is used strictly for power-up conditions, and should not be used to detect any drops
in the power supply voltage. There is no provision for a power-down reset. The power-on circuitry
provides for a 4064 tcyc delay from the time that the oscillator becomes active. If the external
RESET pin is low at the end of the 4064 tcyc time out, the processor remains in the reset condition
until RESET goes high. The user must ensure that V
DD
has risen to a point where the MCU can
operate properly prior to the time the 4064 POR cycles have elapsed. If there is doubt, the external
RESET pin should remain low until such time that V
DD
has risen to the minimum operating voltage
specified.
4.1.2
RESET Pin
The RESET input pin is used to reset the MCU to provide an orderly software start-up procedure.
When using the external reset, the RESET pin must stay low for a minimum of 1.5tcyc. The
RESET pin contains an internal Schmitt Trigger as part of its input to improve noise immunity.
TPG
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC705BD3P | 制造商:Motorola 功能描述:MOTOROLA NXC4C |
| MC68HC705BD7P1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HC705C4ACP | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC705C8AB | 功能描述:IC MCU 8K OTP 2.1MHZ 42-SDIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC705C8ACB | 制造商:Rochester Electronics LLC 功能描述:HCO5 CORE + 8K RAM + EPR - Bulk |
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