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COP8SE Arkusz danych(PDF) 3 Page - National Semiconductor (TI) |
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COP8SE Arkusz danych(HTML) 3 Page - National Semiconductor (TI) |
3 / 47 page 1.0 Device Description (Continued) memory to the CPU. This instruction can be used for table lookup and to read the entire program memory for checksum calculations. RETSK: (Return Skip); Single byte instruction allows return from subroutine and skips next instruction. Decision to branch can be made in the subroutine itself, saving code. AUTOINC/DEC: (Auto-Increment/Auto-Decrement); These instructions use the two memory pointers B and X to effi- ciently process a block of data (analogous to “FOR NEXT” in higher level languages). 1.2.3 Bit-Level Control Bit-level control over many of the microcontroller’s I/O ports provides a flexible means to ease layout concerns and save board space. All members of the COP8 family provide the ability to set, reset and test any individual bit in the data memory address space, including memory-mapped I/O ports and associated registers. 1.2.4 Register Set Three memory-mapped pointers handle register indirect ad- dressing and software stack pointer functions. The memory data pointers allow the option of post-incrementing or post- decrementing with the data movement instructions (LOAD/ EXCHANGE). And 15 memory-maped registers allow de- signers to optimize the precise implementation of certain specific instructions. 1.3 PACKAGING/PIN EFFICIENCY Real estate and board configuration considerations demand maximum space and pin efficiency, particularly given today’s high integration and small product form factors. Microcontrol- ler users try to avoid using large packages to get the I/O needed. Large packages take valuable board space and in- crease device cost, two trade-offs that microcontroller de- signs can ill afford. The COP8 family offers a wide range of packages and does not waste pins: up to 90.9% (or 40 pins in the 44-pin pack- age, these packages are not available on all COP8 devices) are devoted to useful I/O. Connection Diagrams DS100973-6 Top View Order Number COP8SEC516M See NS Package Number M16B DS100973-43 Top View Order Number COP8SEC520M or COP8SER720M See NS Package Number M20B FIGURE 2. Connection Diagrams www.national.com 3 |
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