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MC68340 Scheda tecnica(PDF) 219 Page - Freescale Semiconductor, Inc |
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MC68340 Scheda tecnica(HTML) 219 Page - Freescale Semiconductor, Inc |
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219 / 441 page  5- 82 MC68340 USER’S MANUAL MOTOROLA Operand Data: None Result Data: Requested data is returned as either a word or long word. Byte data is returned in the least significant byte of a word result. Word results return 16 bits of significant data; long-word results return 32 bits. Status of the read operation is returned as in the READ command: $0xxxx for success, $10001 for bus or address errors. 5.6.2.8.11 Fill Memory Block (FILL). FILL is used in conjunction with the WRITE command to fill large blocks of memory. An initial WRITE is executed to set up the starting address of the block and to supply the first operand. Subsequent operands are written with the FILL command. The initial address is incremented by the operand size (1, 2, or 4) and is saved in a temporary register. Subsequent FILL commands use this address, increment it by the current operand size, and store the updated address back in the temporary register. NOTE The FILL command does not check for a valid address in the temporary register—FILL is a valid command only when preceded by another FILL or by a WRITE command. Otherwise, the results are undefined. The NOP command can be used for intercommand padding without corrupting the address pointer. The size field is examined each time a FILL command is given, allowing the operand size to be altered dynamically. Command Format: 15 14 13 12 11 10 9876543210 00011100 OP SIZE 000000 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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