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MC68340 データシート(PDF) 57 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 57 Page - Freescale Semiconductor, Inc |
57 / 441 page 3- 8 MC68340 USER’S MANUAL MOTOROLA DSACK0 DSACK1 A0 SIZ0 SIZ1 01 X 10 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 15–8 of the data bus, asserting DSACK0 and negating DSACK1 to indicate an 8-bit port. The MC68340 then reads the operand byte from bits 15–8 and ignores bits 7–0. 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 byte operand from bits 15–8 and places the operand in the specified location. The slave then asserts DSACK0 to terminate the bus cycle. 3.2.3.2 BYTE OPERAND TO 16-BIT PORT, EVEN (A0 = 0). 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 0100 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 15–8 of the data bus and asserting DSACK1 to indicate a 16-bit port. The MC68340 then reads the operand byte from bits 15–8 and ignores bits 7–0. 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 15–8 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. 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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