參數(shù)資料
型號(hào)： MC68HC11A0CFN2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Single-Chip Microcontroller
中文描述： 8-BIT, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 26/158頁
文件大小： 776K
代理商： MC68HC11A0CFN2
MOTOROLA
2-10
SIGNAL DESCRIPTIONS AND OPERATING MODES
MC68HC11A8
TECHNICAL DATA
2
2.2.4 Additional Boot Loader Program Options
The user may transmit a $55 (only at E clock/16) as the first character rather than the
normal $FF. This will cause the program to jump directly to location $0000, skipping
the download.
The user may tie the receiver to the transmitter (with an external pull-up resistor). This
will cause the program to jump directly to the beginning of EEPROM ($B600). Another
way to cause the program to jump directly to EEPROM is to transmit either a break or
$00 as the first character rather than the normal $FF.
Note that none of these options bypass the security check and so do not compromise
those customers using security.
Keep in mind that upon entry to the downloaded program at location $0000, some reg-
isters have been changed from their reset states. The SCI transmitter and receiver are
enabled which cause port D pins 0 and 1 to be dedicated to SCI use. Also port D is
configured for wired-OR operation. It may be necessary for the user to write to the
SCCR2 and SPCR registers to disable the SCI and/or port D wire-OR operation.
2.2.5 Special Test Operating Mode
The test mode is a special operating mode intended primarily for factory testing. This
mode is very similar to the expanded multiplexed operating mode. In special test op-
erating mode, the reset and interrupt vectors are fetched from external memory loca-
tions $BFC0–$BFFF rather than $FFC0–$FFFF. There are no time limits for protection
of the TMSK2, OPTION, and INIT registers, so these registers may be written repeat-
edly. Also a special TEST1 register is enabled which allows several factory test func-
tions to be invoked.
The special test operating mode is not recommended for use by an end user because
of the reduced system security; however, an end user may wish to come out of reset
in special test operating mode. Then, after some initialization, the SMOD and MDA bits
could be rewritten to select a normal operating mode to re-enable the protection fea-
tures.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11A0CFN3 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
MC68HC11A0CFN3R2 制造商:Rochester Electronics LLC 功能描述:
MC68HC11A0CFN4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0CFNE3 功能描述:8位微控制器 -MCU 8B MCU 768RAM A/D 3MH 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
MC68HC11A0CFNE3 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
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