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參數(shù)資料
| 型號(hào)： | MC68S711E9CFN2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁(yè)數(shù)： | 108/242頁(yè) |
| 文件大?。?/td> | 1672K |
| 代理商： | MC68S711E9CFN2 |
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M68HC11 Bootstrap Mode, Rev. 1.1
196
Freescale Semiconductor
Boot ROM Firmware
The alternate vector locations are achieved by simply driving address bit A14 low during all vector fetches
if SMOD = 1. For special test mode, the alternate vector locations assure that the reset vector can be
fetched from external memory space so the test system can control MCU operation. In special bootstrap
mode, the small boot ROM is enabled in the memory map by RBOOT = 1 so the reset vector will be
fetched from this ROM and the bootloader firmware will control MCU operation.
RBOOT is reset to 1 in bootstrap mode to enable the small boot ROM. In the other three modes, RBOOT
is reset to 0 to keep the boot ROM out of the memory map. While in special test mode, SMOD = 1, which
allows the RBOOT control bit to be written to 1 by software to enable the boot ROM for testing purposes.
Boot ROM Firmware
The main program in the boot ROM is the bootloader, which is automatically executed as a result of
resetting the MCU in bootstrap mode. Some newer versions of the M68HC11 Family have additional utility
programs that can be called from a downloaded program. One utility is available to program EPROM or
OTP versions of the M68HC11. A second utility allows the contents of memory locations to be uploaded
to a host computer. In the MC68HC711K4 boot ROM, a section of code is used by Freescale for stress
testing the on-chip EEPROM. These test and utility programs are similar to self-test ROM programs in
other MCUs except that the boot ROM does not use valuable space in the normal memory map.
Bootstrap firmware is also involved in an optional EEPROM security function on some versions of the
M68HC11. This EEPROM security feature prevents a software pirate from seeing what is in the on-chip
EEPROM. The secured state is invoked by programming the no security (NOSEC) EEPROM bit in the
CONFIG register. Once this NOSEC bit is programmed to 0, the MCU will ignore the mode A pin and
always come out of reset in normal single-chip mode or special bootstrap mode, depending on the state
of the mode B pin. Normal single-chip mode is the usual way a secured part would be used. Special
bootstrap mode is used to disengage the security function (only after the contents of EEPROM and RAM
have been erased). Refer to the M68HC11 Reference Manual, Freescale document order number
M68HC11RM/AD, for additional information on the security mode and complete listings of the boot ROMs
that support the EEPROM security functions.
Automatic Selection of Baud Rate
The bootloader program in the MC68HC711E9 accommodates either of two baud rates.
The higher of these baud rates (7812 baud at a 2-MHz E-clock rate) is used in systems that operate
from a binary frequency crystal such as 223 Hz (8.389 MHz). At this crystal frequency, the baud
rate is 8192 baud, which was used extensively in automotive applications.
The second baud rate available to the M68HC11 bootloader is 1200 baud at a 2-MHz E-clock rate.
Some of the newest versions of the M68HC11, including the MC68HC11F1 and MC68HC117K4,
accommodate other baud rates using the same differentiation technique explained here. Refer to
the reference numbers in square brackets in Figure 2 during the following explanation.
NOTE
Software can change some aspects of the memory map after reset.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC11E9MPB2 | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP52 |
| MC68HC711E9CFS2 | 8-BIT, UVPROM, 2 MHz, MICROCONTROLLER, CQCC52 |
| MC68L11E1PB2 | 8-BIT, 2 MHz, MICROCONTROLLER, PQFP52 |
| MC68HC11E9VFU2 | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC711E20CFN2 | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQCC52 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68S711E9CFNE2 | 功能描述:8位微控制器 -MCU 8B MCU 512 RAM EPP 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 |
| MC68SEC000AA10 | 功能描述:微處理器 - MPU 8/16/32 BIT MPU STATIC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| MC68SEC000AA10R2 | 功能描述:IC MPU 32BIT 10MHZ 64-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微處理器 系列:M680x0 標(biāo)準(zhǔn)包裝:2 系列:MPC8xx 處理器類型:32-位 MPC8xx PowerQUICC 特點(diǎn):- 速度:133MHz 電壓:3.3V 安裝類型:表面貼裝 封裝/外殼:357-BBGA 供應(yīng)商設(shè)備封裝:357-PBGA（25x25） 包裝:托盤(pán) |
| MC68SEC000AA16 | 功能描述:微處理器 - MPU 8/16/32 BIT MPU STATIC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| MC68SEC000AA16 | 制造商:Freescale Semiconductor 功能描述:Microprocessor |
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