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MC68340 データシート(PDF) 39 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 39 Page - Freescale Semiconductor, Inc |
39 / 441 page MOTOROLA MC68340 USER’S MANUAL 2- 5 last falling edge of the clock for that bus cycle. For a write cycle, all 16 bits of the data bus are driven, regardless of the port width or operand size. The MC68340 places the data on the data bus approximately one-half clock cycle after AS is asserted in a write cycle. 2.4 FUNCTION CODES (FC3–FC0) These signals are outputs that indicate one of 16 address spaces to which the address applies. Fifteen of these spaces are designated as either user or supervisor, program or data, and normal or direct memory access (DMA) spaces. One other address space is designated as CPU space to allow the CPU32 to acquire specific control information not normally associated with read or write bus cycles. The function code signals are valid while AS is asserted. See Table 2-2 for more information. Table 2-2. Address Space Encoding Function Code Bits 3210 Address Spaces 0000 Reserved (Motorola) 0001 User Data Space 0010 User Program Space 0011 Reserved (User ) 0100 Reserved (Motorola) 0101 Supervisor Data Space 0110 Supervisor Program Space 0111 CPU Space 1 x x x DMA Space 2.5 CHIP SELECTS (CS3–CS0) These pins can be programmed to be chip select output signals, port B parallel I/O and autovector input, or additional interrupt request lines. Refer to Section 4 System Integration Module for more information on these signals. CS3– CS0 The chip select output signals enable peripherals at programmed addresses. These signals are inactive high (not high impedance) after reset. CS0 is the chip select for a boot ROM containing the reset vector and initialization program. It functions as the boot chip select immediately after reset. IRQ4, IRQ2, IRQ1 Interrupt request lines are external interrupt lines to the CPU32. These additional interrupt request lines are selected by the FIRQ bit in the module configuration register. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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同様の説明 - MC68340 |
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