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MC68340 データシート(PDF) 58 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 58 Page - Freescale Semiconductor, Inc |
58 / 441 page MOTOROLA MC68340 USER’S MANUAL 3- 9 3.2.3.3 BYTE OPERAND TO 16-BIT PORT, ODD (A0 = 1). The MC68340 drives the address bus with the desired address and the SIZx pins to indicate a single-byte operand. DSACK0 DSACK1 A0 SIZ0 SIZ1 0110 X D0 D8 D15 D7 (OP0) OP0 OP0 7 0 BYTE OPERAND DATA BUS CYCLE 1 For a read operation, the slave responds by placing data on bits 7–0 of the data bus and asserting DSACK1 to indicate a 16-bit port. The MC68340 then reads the operand byte from bits 7–0 and ignores bits 15–8. For a write operation, the MC68340 drives the single-byte operand on both bytes of the data bus because it does not know the port size until the DSACK ≈ signals are read. The slave device reads the operand from bits 7–0 of the data bus and uses the address to place the operand in the specified location. The slave then asserts DSACK1 to terminate the bus cycle. 3.2.3.4 WORD OPERAND TO 8-BIT PORT, ALIGNED. The MC68340 drives the address bus with the desired address and the SIZx pins to indicate a word operand. D0 D8 D15 D7 OP0 OP1 OP0 OP1 15 7 0 DSACK0 DSACK1 A0 SIZ0 SIZ1 10010 01110 WORD OPERAND DATA BUS CYCLE 1 CYCLE 2 (OP1) (OP1) 8 For a read operation, the slave responds by placing the most significant byte of the operand on bits 15–8 of the data bus and asserting DSACK0 to indicate an 8-bit port. The MC68340 reads the most significant byte of the operand from bits 15–8 and ignores bits 7–0. The MC68340 then decrements the transfer size counter, increments the address, and reads the least significant byte of the operand from bits 15–8 of the data bus. For a write operation, the MC68340 drives the word operand on bits 15–0 of the data bus. The slave device then reads the most significant byte of the operand from bits 15–8 of the data bus and asserts DSACK0 to indicate that it received the data but is an 8-bit port. The MC68340 then decrements the transfer size counter, increments the address, and writes the least significant byte of the operand to bits 15–8 of the data bus. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
同様の部品番号 - MC68340 |
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同様の説明 - MC68340 |
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