參數(shù)資料
型號(hào)： MC68HC11ED0MFU3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 3 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁(yè)數(shù)： 61/108頁(yè)
文件大?。?/td> 1672K
代理商： MC68HC11ED0MFU3
Technical Summary
MC68HC11ED0 — Rev. 1.0
Operating Modes and On-Chip Memory
Operating Modes and On-Chip Memory
4.5.2 RAM
The MC68HC11ED0 has 512 bytes of on-chip static RAM. The RAM can
be mapped to any 4-Kbyte boundary. Upon reset, the RAM is mapped at
$0000–$01FF. The register block also begins at $0000 and overlaps the
RAM space. Since registers have priority over RAM, this causes 64
bytes of RAM to be lost. However, the user can map either the RAM or
the register block to any 4-Kbyte boundary ($x000) and access the full
512 bytes of RAM. Remapping is accomplished by writing appropriate
values to the INIT register.
When power is removed form the MCU, RAM contents may be
preserved using the MODB/VSTBY pin. A 4-volt nominal power source
applied to this pin protects all 512 bytes of RAM.
NOTE:
INIT can be written only once in the first 64-cycles out of reset in normal
modes or at any time in special modes.
RAM[3:0] — Internal RAM Map Position Bits
These bits determine the upper four bits of the RAM address. At reset
RAM is mapped to $0000 and includes the register block. Refer to
REG[3:0] — 128-Byte Register Block Map Position Bits
These bits determine the upper four bits of the register space
address. At reset registers are mapped to $0000 and overwrite the
first 64 bytes of RAM. Refer to Figure 4-3.
Address:
$003D
Bit 7
6
54321
Bit 0
Read:
RAM3
RAM2
RAM1
RAM0
REG3
REG2
REG1
REG0
Write:
Reset:
00
000000
Figure 4-5. RAM and Register Mapping Register (INIT)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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