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MC68EC030 Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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MC68EC030 Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
5 / 36 page MOTOROLA MC68EC030 TECHNICAL DATA 5 The ACU contains two access control registers that are used to define memory segments ranging in size from 16 Mbytes to 2 Gbytes each. Each segment is definable in terms of address, read/write access, and function code. Each segment can be marked as cacheable or non cacheable to control cache accesses to that memory space. PROGRAMMING MODEL As shown in the programming models (see Figures 3 and 4), the MC68EC030 has 16 32-bit general- purpose registers, a 32-bit program counter, two 32-bit supervisor stack pointers, a 16-bit status register, a 32-bit vector base register, two 3-bit alternate function code registers, two 32-bit cache handling (address and control) registers, and two 32-bit transparent translation registers. Registers D0–D7 are used as data registers for bit and bit field (1 to 32 bit), byte (8 bit), word (16 bit), long-word (32 bit), and quad-word (64 bit) operations. Registers A0–A6 and the user, interrupt, and master stack pointers are address registers that may be used as software stack pointers or base address registers. In addition, the address registers may be used for word and long-word operations. All 16 general-purpose registers (D0– D7, A0–A7) can be used as index registers. 31 15 16 0 31 15 16 0 31 0 0 7 D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 A3 A4 A5 A6 A7 (USP) PC CCR DATA REGISTERS ADDRESS REGISTERS USER STACK POINTER CONDITION CODE REGISTER PROGRAM COUNTER 7 8 15 0 31 15 16 0 8 Figure 3. User Programming Model Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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