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參數(shù)資料
| 型號(hào)： | MC9S08QD4CPC |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDIP8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 113/198頁(yè) |
| 文件大?。?/td> | 2473K |
| 代理商： | MC9S08QD4CPC |
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Chapter 2 External Signal Description
MC9S08QD4 Series MCU Data Sheet, Rev. 6
Freescale Semiconductor
21
2.2.2
Oscillator
Out of reset the MCU uses an internally generated clock provided by the internal clock source (ICS)
module. The internal frequency is nominally 16 MHz and the default ICS settings will provide for a 4 MHz
bus out of reset. For more information on the ICS, see the Internal Clock Source chapter.
2.2.3
Reset (Input Only)
After a power-on reset (POR) into user mode, the PTA5/TPM2CH0I/IRQ/RESET pin defaults to a
general-purpose input port pin, PTA5. Setting RSTPE in SOPT1 configures the pin to be the RESET input
pin. Once configured as RESET, the pin will remain RESET until the next POR. The RESET pin can be
used to reset the MCU from an external source when the pin is driven low. When enabled as the RESET
pin (RSTPE = 1), an internal pullup device is automatically enabled.
After a POR into active background mode, the PTA5/TPM2CH0I/IRQ/RESET pin defaults to the RESET
pin.
When TPM2 is configured for input capture, the pin will be the input capture pin TPM2CH0I.
NOTE
This pin does not contain a clamp diode to VDD and must not be driven
above VDD.
The voltage measured on the internally pulled up RESET pin may be as low
as VDD – 0.7 V. The internal gates connected to this pin are pulled to VDD.
2.2.4
Background / Mode Select (BKGD/MS)
During a power-on-reset (POR) or background debug force reset (see Section 5.8.3, “System Background
Debug Force Reset Register (SBDFR)” for more information), the PTA4/TPM2CH0O/BKGD/MS pin
functions as a mode select pin. Immediately after any reset, the pin functions as the background pin and
can be used for background debug communication. When enabled as the BKGD/MS pin (BKGDPE = 1),
an internal pullup device is automatically enabled.
The background debug communication function is enabled when BKGDPE in SOPT1 is set. BKGDPE is
set following any reset of the MCU and must be cleared to use the PTA4/TPM2CH0O/BKGD/MS pins
alternative pin functions.
If nothing is connected to this pin, the MCU will enter normal operating mode at the rising edge of the
internal reset after a POR or force BDC reset. If a debug system is connected to the 6-pin standard
background debug header, it can hold BKGD/MS low during a POR or immediately after issuing a
background debug force reset, which will force the MCU to active background mode.
The BKGD pin is used primarily for background debug controller (BDC) communications using a custom
protocol that uses 16 clock cycles of the target MCU’s BDC clock per bit time. The target MCU’s BDC
clock could be as fast as the maximum bus clock rate, so there must never be any significant capacitance
connected to the BKGD/MS pin that could interfere with background serial communications.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC9S08QD4CPS | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit HCS08 Central Processor Unit (CPU) |
| MC9S08QD4CSC | 功能描述:8位微控制器 -MCU 9S08QD4 SERIES RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度: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 |
| MC9S08QD4CSCR | 功能描述:8位微控制器 -MCU 9S08QD4 SERIES RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度: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 |
| MC9S08QD4MPC | 功能描述:8位微控制器 -MCU 9S08QD4 SERIES RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度: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 |
| MC9S08QD4MPS | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit HCS08 Central Processor Unit (CPU) |
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