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H8SX/1663 数据表(PDF) 474 Page - Renesas Technology Corp |
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H8SX/1663 数据表(HTML) 474 Page - Renesas Technology Corp |
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474 / 1158 page  Section 8 Data Transfer Controller (DTC) Rev.1.00 Jun. 07, 2006 Page 422 of 1102 REJ09B0294-0100 Table 8.10 Number of Cycles Required for Each Execution State Object to be Accessed On-Chip RAM On-Chip ROM On-Chip I/O Registers External Devices Bus width 32 32 8 16 32 8 16 Access cycles 1 1 2 2 2 2 3 2 3 Vector read S I 1 1 8 12 + 4m 4 6 + 2m Transfer information read S J 1 1 8 12 + 4m 4 6 + 2m Execution status Transfer information write S k 1 1 8 12 + 4m 4 6 + 2m Byte data read S L 1 1 2 2 2 2 3 + m 2 3 + m Word data read S L 1 1 4 2 2 4 4 + 2m 2 3 + m Longword data read S L 1 1 8 4 2 8 12 + 4m 4 6 + 2m Byte data write S M 1 1 2 2 2 2 3 + m 2 3 + m Word data write S M 1 1 4 2 2 4 4 + 2m 2 3 + m Longword data write S M 1 1 8 4 2 8 12 + 4m 4 6 + 2m Internal operation S N 1 [Legend] m: Number of wait cycles 0 to 7 (For details, see section 6, Bus Controller (BSC).) The number of execution cycles is calculated from the formula below. Note that Σ means the sum of all transfers activated by one activation event (the number in which the CHNE bit is set to 1, plus 1). Number of execution cycles = I • S I + Σ (J • S J + K • S K + L • S L + M • S M) + N • S N 8.5.10 DTC Bus Release Timing The DTC requests the bus mastership to the bus arbiter when an activation request occurs. The DTC releases the bus after a vector read, transfer information read, a single data transfer, or transfer information writeback. The DTC does not release the bus during transfer information read, single data transfer, or transfer information writeback. 8.5.11 DTC Priority Level Control to the CPU The priority of the DTC activation sources over the CPU can be controlled by the CPU priority level specified by bits CPUP2 to CPUP0 in CPUPCR and the DTC priority level specified by bits DTCP2 to DTCP0. For details, see section 5, Interrupt Controller. |
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