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參數(shù)資料
| 型號： | MC68HC11A0CFN2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁數(shù)： | 76/158頁 |
| 文件大?。?/td> | 3803K |
| 代理商： | MC68HC11A0CFN2 |
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SIGNAL DESCRIPTIONS AND OPERATING MODES
MC68HC11A8
2-8
TECHNICAL DATA
2
Figure 2-4 Address/Data Demultiplexing
2.2.3 Special Bootstrap Operating Mode
The bootstrap mode is considered a special operating mode as distinguished from the
normal single-chip operating mode. This is a very versatile operating mode since there
are essentially no limitations on the special purpose program that can be loaded into
the internal RAM. The boot loader program is contained in the 192 byte bootstrap
ROM. This ROM is enabled only if the MCU is reset in special bootstrap operating
mode, and appears as internal memory space at locations $BF40-$BFFF. The boot
loader program will use the SCI to read a 256 byte program into on-chip RAM at loca-
tions $0000-$00FF. After the character for address $00FF is received, control is auto-
matically passed to that program at location $0000.
The MC68HC11A8 communicates through the SCI port. After reset in special boot-
strap operating mode, the SCI is running at E clock/16 (7812 baud for E clock equal 2
MHz). If the security feature was specified and the security bit is set, $FF is output by
the SCI transmitter. The EEPROM is then erased. If erasure is unsuccessful, $FF is
output again and erasure is attempted again. Upon successful erasure of the EE-
PROM, all internal RAM is written over with $FF. The CONFIG register is then erased.
The boot loader program now proceeds as though the part had not been in security
mode.
HC373
MC68HC11A8
ADDR/DATA DEMUX
A14
A13
A12
A11
A10
A9
A8
A15
A6
A5
A4
A3
A2
A1
A0
A7
D6
D5
D4
D3
D2
D1
D0
D7
D2
D3
D4
D5
D6
D7
D8
D1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q1
OE
LE
PC6/A6/D6
PC5/A5/D5
PC4/A4/D4
PC3/A3/D3
PC2/A2/D2
PC1/A1/D1
PC0/A0/D0
PC7/A7/D7
AS
PB6/A14
PB5/A13
PB4/A12
PB3/A11
PB2/A10
PB1/A9
PB0/A8
PB7/A15
R/W
E
WE
F
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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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 最大時鐘頻率:50 MHz 程序存儲器大小: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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