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| 型号： | MC68HC11ED0CFN2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 2 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 53/108页 |
| 文件大小： | 1672K |
| 代理商： | MC68HC11ED0CFN2 |
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Operating Modes and On-Chip Memory
On-Chip Memory
MC68HC11ED0 — Rev. 1.0
Technical Summary
Operating Modes and On-Chip Memory
4.5.1 Memory Map and Register Block
The INIT register controls the location of the register block and RAM in
the 64-Kbyte central processor unit (CPU) address space. The 64-Kbyte
register block originates at $0000 after reset and can be placed at any
4-Kbyte boundary ($x000) by writing an appropriate value to the INIT
register. Since the RAM also begins at $0000 after reset, 64 bytes are
overlaid by the register block. Registers are a higher priority resource
than RAM. Therefore, the RAM which is overlaid by registers is
inaccessible. Either the registers or the RAM must be remapped to gain
access to all 512 bytes of the RAM. Refer to Figure 4-3 and Figure 4-4.
Figure 4-3. MC68HC11ED0 Memory Map
$FFC0
$FFFF
NORMAL MODE
INTERRUPT VECTORS
EXTERNAL
448 BYTES RAM(1)
64-BYTE REGISTER BLOCK(1)
BOOTSTRAP
SPECIAL
TEST
$0000
$0200
$FFC0
$FFFF
$0000
$0040
$103F
$BF00
EXPANDED
$BFFF
$BFC0
$BFFF
SPECIAL MODES
INTERRUPT
VECTORS
BOOT
ROM
EXT
$003F
EXT
$0040
$01FF
EXT
CAN BE REMAPPED TO ANY
4-K PAGE BY THE INIT REGISTER
CAN BE REMAPPED TO ANY
4-K PAGE BY THE INIT REGISTER
Note 1. To access the full 512 bytes of RAM, remap either the register block
or the RAM to any 4-K ($x000) boundary.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相关代理商/技术参数 |
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| MC68HC11ED0CFN3 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Technical Summary |
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