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參數(shù)資料
| 型號： | MC68HC11F1FU1 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | ROM-based high-performance microcontrollers |
| 中文描述： | 基于ROM的高性能微控制器 |
| 文件頁數(shù)： | 36/124頁 |
| 文件大?。?/td> | 840K |
| 代理商： | MC68HC11F1FU1 |
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OPERATING MODES AND ON-CHIP MEMORY
For More Information On This Product,
Go to: www.freescale.com
4-2
TECHNICAL DATA
Figure 4-1 Address/Data Demultiplexing
4.1.3 Special Test Mode
Special test, a variation of the expanded multiplexed mode, is primarily used during
Motorola's internal production testing; however, it is accessible for programming the
CONFIG register, and supporting emulation and debugging during development.
4.1.4 Bootstrap Mode
When the MCU is reset in special bootstrap mode, a small amount of on-chip ROM is
enabled at address $BF00–$BFFF. The ROM contains a bootloader program and a
special set of interrupt and reset vectors. The MCU fetches the reset vector, then ex-
ecutes the bootloader.
For normal use of the bootloader program, send $FF to the SCI receiver at either E
clock
÷
16, or E clock
÷
104 (1200 baud for E clock equals 2 MHz). Then download up
to 192 bytes of program data, which is put into RAM starting at $0040. These charac-
ters are echoed through the transmitter. When loading is complete, the program jumps
to location $0040 and begins executing the code. The bootloader program ends the
download after 192 bytes, or when the received data line is idle for at least four char-
acter times. Use of an external pullup resistor is required when using the SCI transmit-
ter pin because port D pins are configured for wired-OR operation by the bootloader.
In bootstrap mode, the interrupt vectors are directed to RAM. This allows the use of
interrupts through a jump table. Refer to
Freescale
application note AN1060,
MC68HC11 Bootstrap Mode.
HC373
MCU
ADDR/DATA DEMUX
ADDR13
ADDR12
ADDR11
ADDR10
ADDR9
ADDR8
ADDR14
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
ADDR6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
DATA6
D2
D3
D4
D5
D6
D7
D8
LE
D1
Q3
Q4
Q5
Q6
Q7
Q8
OE
Q2
PC5
PC4
PC3
PC2
PC1
PC0
AS
PC6
PB5
PB4
PB3
PB2
PB1
PB0
PB6
R/W
E
WE
OE
F
Freescale Semiconductor, Inc.
n
.
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