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| 型號(hào)： | MC68HC711K4 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-channel, 8-bit analog-to-digital (A/D) converter |
| 中文描述： | 8通道，8位模擬至數(shù)字（A / D）轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 218/268頁(yè) |
| 文件大?。?/td> | 2221K |
| 代理商： | MC68HC711K4 |
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Application Note
AN1060 — Rev. 1.0
218
MOTOROLA
The SCI receiver and transmitter are enabled. The receiver is required
by the bootloading process, and the transmitter is used to transmit data
back to the host computer for optional verification. The last item in the
initialization is to set an intercharacter delay constant used to terminate
the download when the host computer stops sending data to the
MC68HC711E9. This delay constant is stored in the timer output
compare 1 (TOC1) register, but the on-chip timer is not used in the
bootloader program. This example illustrates the extreme measures
used in the bootloader firmware to minimize memory usage. However,
such measures are not usually considered good programming technique
because they are misleading to someone trying to understand the
program or use it as an example.
After initialization, a break character is transmitted [3] by the SCI. By
connecting the TxD pin to the RxD pin (with a pullup because of port D
wired-OR mode), this break will be received as a $00 character and
cause an immediate jump [4] to the start of the on-chip EEPROM ($B600
in the MC68HC711E9). This feature is useful to pass control to a
program in EEPROM essentially from reset. Refer to
Common
Bootstrap Mode Problems
before using this feature.
If the first character is received as $FF, the baud rate is assumed to be
the default rate (7812 baud at a 2-MHz E-clock rate). If $FF was sent at
1200 baud by the host, the SCI will receive the character as $E0 or $C0
because of the baud rate mismatch, and the bootloader will switch to
1200 baud [5] for the rest of the download operation. When the baud rate
is switched to 1200 baud, the delay constant used to monitor the
intercharacter delay also must be changed to reflect the new character
time.
At [6], the Y index register is initialized to $0000 to point to the start of
on-chip RAM. The index register Y is used to keep track of where the
next received data byte will be stored in RAM. The main loop for loading
begins at [7].
The number of data bytes in the downloaded program can be any
number between 0 and 512 bytes (the size of on-chip RAM). This
procedure is called "variable-length download" and is accomplished by
ending the download sequence when an idle time of at least four
character times occurs after the last character to be downloaded. In
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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| MC68HC11E20 | CONFIG Register Programming for EEPROM-based M68HC11 Microcontrollers |
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| MC68HC11KA1 | CONFIG Register Programming for EEPROM-based M68HC11 Microcontrollers |
| MC68HC11KA2 | CONFIG Register Programming for EEPROM-based M68HC11 Microcontrollers |
| MC68HC11KA3 | CONFIG Register Programming for EEPROM-based M68HC11 Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC711K4CFN4 | 功能描述:IC MCU 24K OTP 4MHZ 84-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 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(pán) 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC711K4CFNE3 | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC711K4CFNE4 | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC711K4CFU4 | 功能描述:IC MCU 24K 4MHZ EEPROM 80-QFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 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:497-9032STM32F101T8U6-ND |
| MC68HC711KS2CPU4 | 制造商:Motorola Inc 功能描述: |
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