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寤犲晢锛� Freescale Semiconductor
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鎻忚堪锛� IC MPU 32BIT 20MHZ 184-CQFP
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绯诲垪锛� M680x0
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瀹夎椤�(l猫i)鍨嬶細 琛ㄩ潰璨艰
灏佽/澶栨锛� 184-BCQFP
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 184-CQFP锛�31.3x31.3锛�
鍖呰锛� 鎵樼洡(p谩n)
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MOTOROLA
M68040 USER鈥橲 MANUAL
B-5
MC68EC040 REV2.3 (01/31/2000)
B.3.1 Access Control Registers
Each ACU has two independent access control registers (ACRs). The instruction ACU con-
tains the instruction access control registers (IACR0 and IACR1). The data ACU contains
the data access control registers (DACR0 and DACR1). Both ACRs provide and control sta-
tus information for access control of memory in the MC68EC040. Only programs that exe-
cute in the supervisor mode using the MOVEC instruction can directly access the ACRs.
The 32-bit ACRs each dene blocks of MC68EC040:address space for access control.
These blocks of address space can overlap or be separate, and are a minimum of 16
Mbytes. Three blocks are used with two user-dened attributes, cachability control and
optional write protection. The ACRs specify a block of address space as serialized noncach-
able for peripheral selections and as write-through for shared blocks of address space in
multi-processing applications. The ACRs can be congured to support many embedded
control applications while maintaining cache integrity. Refer to Section 4 Instruction and
Data Caches for details concerning cachability. Figure B-4 illustrates the ACR format.
Figure B-4. MC68EC040 Access Control Register Format
ADDRESS BASE
This 8-bit field is compared with physical address bits A31鈥揂24. Addresses that match in
this comparison (and are otherwise eligible) are accessible.
ADDRESS MASK
This 8-bit field contains a mask for the ADDRESS BASE field. Setting a bit in the AD-
DRESS MASK field causes the processor to ignore the corresponding bit in the AD-
DRESS BASE field. Setting some of the ADDRESS MASK bits to ones obtains blocks of
memory larger than 16 Mbytes. The low-order bits of this field are normally set to define
contiguous blocks larger than 16 Mbytes, although contiguous blocks are not required.
E鈥擡nable
This bit enables and disables transparent translation of the block defined by this register.
Refer
to
Section
3
Memory
Management
Unit
(Except
MC68EC040
and
MC68EC040V) for details on transparent translation.
0 = Access control disabled.
1 = Access control enabled.
S鈥擲upervisor/User Mode
This field specifies the way FC2 is used in matching an address:
00 =Match only if FC2 = 0 (user mode access).
01 =Match only if FC2 = 1 (supervisor mode access).
10, 11 =Ignore FC2 when matching.
31
24 23
16 15 14 13 12 11 10
9
876543210
LOGICAL ADDRESS BASE
LOGICAL ADDRESS MASK E
S
0
U1
U0
0
CM
0
W
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MC68EC040FE20B 鍒堕€犲晢:MOTOROLA 鍒堕€犲晢鍏ㄧū(ch膿ng):Motorola, Inc 鍔熻兘鎻忚堪:M68000-compatible, high-performance, 32-bit microprocessors
MC68EC040FE25 鍒堕€犲晢:Motorola Inc 鍔熻兘鎻忚堪:
MC68EC040FE25A 鍔熻兘鎻忚堪:寰檿鐞嗗櫒 - MPU 32B W/ CACHE RoHS:鍚� 鍒堕€犲晢:Atmel 铏曠悊鍣ㄧ郴鍒�:SAMA5D31 鏍稿績:ARM Cortex A5 鏁�(sh霉)鎿�(j霉)绺界窔(xi脿n)瀵害:32 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:536 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:32 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:128 KB 鎺ュ彛椤�(l猫i)鍨�:CAN, Ethernet, LIN, SPI,TWI, UART, USB 宸ヤ綔闆绘簮闆诲:1.8 V to 3.3 V 鏈€澶у伐浣滄韩搴�:+ 85 C 瀹夎棰�(f膿ng)鏍�:SMD/SMT 灏佽 / 绠遍珨:FBGA-324
MC68EC040FE25B 鍒堕€犲晢:MOTOROLA 鍒堕€犲晢鍏ㄧū(ch膿ng):Motorola, Inc 鍔熻兘鎻忚堪:M68000-compatible, high-performance, 32-bit microprocessors
MC68EC040FE33A 鍔熻兘鎻忚堪:寰檿鐞嗗櫒 - MPU 32B W/ CACHE RoHS:鍚� 鍒堕€犲晢:Atmel 铏曠悊鍣ㄧ郴鍒�:SAMA5D31 鏍稿績:ARM Cortex A5 鏁�(sh霉)鎿�(j霉)绺界窔(xi脿n)瀵害:32 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:536 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:32 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:128 KB 鎺ュ彛椤�(l猫i)鍨�:CAN, Ethernet, LIN, SPI,TWI, UART, USB 宸ヤ綔闆绘簮闆诲:1.8 V to 3.3 V 鏈€澶у伐浣滄韩搴�:+ 85 C 瀹夎棰�(f膿ng)鏍�:SMD/SMT 灏佽 / 绠遍珨:FBGA-324