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參數(shù)資料
| 型號(hào)： | MC9S08QD2VPC |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 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)： | 70/198頁(yè) |
| 文件大?。?/td> | 2473K |
| 代理商： | MC9S08QD2VPC |
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Development Support
MC9S08QD4 Series MCU Data Sheet, Rev. 6
Freescale Semiconductor
161
Figure 12-1. BDM Tool Connector
12.2.1
BKGD Pin Description
BKGD is the single-wire background debug interface pin. The primary function of this pin is for
bidirectional serial communication of active background mode commands and data. During reset, this pin
is used to select between starting in active background mode or starting the user’s application program.
This pin is also used to request a timed sync response pulse to allow a host development tool to determine
the correct clock frequency for background debug serial communications.
BDC serial communications use a custom serial protocol first introduced on the M68HC12 Family of
microcontrollers. This protocol assumes the host knows the communication clock rate that is determined
by the target BDC clock rate. All communication is initiated and controlled by the host that drives a
high-to-low edge to signal the beginning of each bit time. Commands and data are sent most significant
bit first (MSB first). For a detailed description of the communications protocol, refer to Section 12.2.2,
If a host is attempting to communicate with a target MCU that has an unknown BDC clock rate, a SYNC
command may be sent to the target MCU to request a timed sync response signal from which the host can
determine the correct communication speed.
BKGD is a pseudo-open-drain pin and there is an on-chip pullup so no external pullup resistor is required.
Unlike typical open-drain pins, the external RC time constant on this pin, which is influenced by external
capacitance, plays almost no role in signal rise time. The custom protocol provides for brief, actively
driven speedup pulses to force rapid rise times on this pin without risking harmful drive level conflicts.
Refer to Section 12.2.2, “Communication Details,” for more detail.
When no debugger pod is connected to the 6-pin BDM interface connector, the internal pullup on BKGD
chooses normal operating mode. When a debug pod is connected to BKGD it is possible to force the MCU
into active background mode after reset. The specific conditions for forcing active background depend
upon the HCS08 derivative (refer to the introduction to this Development Support section). It is not
necessary to reset the target MCU to communicate with it through the background debug interface.
12.2.2
Communication Details
The BDC serial interface requires the external controller to generate a falling edge on the BKGD pin to
indicate the start of each bit time. The external controller provides this falling edge whether data is
transmitted or received.
BKGD is a pseudo-open-drain pin that can be driven either by an external controller or by the MCU. Data
is transferred MSB first at 16 BDC clock cycles per bit (nominal speed). The interface times out if
512 BDC clock cycles occur between falling edges from the host. Any BDC command that was in progress
2
4
6
NO CONNECT 5
NO CONNECT 3
1
RESET
BKGD
GND
VDD
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| MC9S08QE128CLC | 8-BIT, FLASH, 50.33 MHz, MICROCONTROLLER, PQFP32 |
| MC9S08QE64CQD | 8-BIT, FLASH, 50.33 MHz, MICROCONTROLLER, PQFP44 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC9S08QD2VPS | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:8-Bit HCS08 Central Processor Unit (CPU) |
| MC9S08QD2VSC | 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 |
| MC9S08QD2VSCR | 制造商:Freescale Semiconductor 功能描述:9S08QD4 SERIES - Tape and Reel |
| MC9S08QD4 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC9S08QD4_07 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:8-Bit HCS08 Central Processor Unit (CPU) |
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