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參數(shù)資料
| 型號(hào)： | MC68HC11G5CFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC84 |
| 封裝： | PLASTIC, LCC-84 |
| 文件頁(yè)數(shù)： | 122/195頁(yè) |
| 文件大小： | 982K |
| 代理商： | MC68HC11G5CFN |
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MEMORY AND CONTROL/STATUS REGISTERS
3-4
3.4.3
Special Bootstrap Mode
This special mode is established by having a logic zero level on both the MODB/Vkam pin and the
MODA/LIR pin at the rising edge of RESET. The ROMON bit in the CONFIG register is a one out
of reset in this mode, so that the user ROM appears in the map. The initial memory map which results
is also controlled by the state of three bits (RBOOT, SMOD, and MDA) in the HPRIO control register
which are initialized automatically by hardware prior to the rising edge on RESET.
Initial conditions affecting the memory map are:
ROMON = 1, RBOOT = 1, SMOD = 1, MDA = 0
3.4.4
Special Test Mode
This special mode is established by having a logic zero level on the MODB/Vkam pin and a logic one
level on the MODA/LIR pin at the rising edge of RESET. The ROMON bit in the CONFIG register
is a one out of reset in this mode, so that the user ROM appears in the map. The initial memory map
which results is actually controlled by the state of three bits (RBOOT, SMOD, and MDA) in the
HPRIO control register which were initialized automatically by hardware prior to the rising edge on
RESET.
Initial conditions affecting the memory map are:
ROMON = 1, RBOOT = 0, SMOD = 1, MDA = 1
3.4.5
Changing Modes
Changing the operating mode and the bits described above is subject to some restrictions in normal
modes. First of all, ROMON, RBOOT and SMOD will stay in their reset state. These bits cannot be
changed in the normal operating modes. In order to allow a user to have an expanded mode system
with the ROM on, the user is allowed to change MDA once only. This means that the user can bring
the device out of reset in single chip mode, and then write MDA to a 1, thus putting the part into
expanded mode with the ROM on (ROMON = 1).
If the user does not intend to change modes after coming out of reset, he may wish to write MDA
one time to the same state. As MDA may be written to only once; this will prevent an accidental write
from changing the mode at some later time.
In the special operating modes, ROMON, RBOOT and MDA may be written at any time to either 0
or 1. SMOD cannot be written back to a 1 after being written to a 0, because the part will no longer
be in a special mode.
3.5
SYSTEM CONFIGURATION
The MC68HC11G5 allows the user to configure the MCU system to his specific requirements via
hard wired options, such as the mode select pins, and via internal software programmable control
Freescale
Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc.
..
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
MC68HC11G5,
MC68HC11G7,
MC68HC711G5
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| MC68HC11L6VFU22 | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC11L6MFU22 | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC11G7 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller Unit |
| MC68HC11G7CFN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| MC68HC11K0 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC11K0CFN2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-Bit Microcontroller |
| MC68HC11K0CFN3 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-Bit Microcontroller |
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