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TMPR4937 Datasheet(PDF) 160 Page - Toshiba Semiconductor |
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TMPR4937 Datasheet(HTML) 160 Page - Toshiba Semiconductor |
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160 / 552 page ![]() Chapter 8 DMA Controller 8-4 8.3 Detailed Explanation 8.3.1 Transfer Mode The DMA Controller (DMAC0, DMAC1) supports five transfer mode types (refer to Table 8.3.1 below). The setting of the External Request bit (DMCCRn.EXTRQ) of the DMA Channel Control Register selects whether transfer with an I/O device is a DMA transfer. • I/O DMA Transfer Mode (DMCCRn.EXTRQ = “1”) Perform DMA transfer with either an external device connected to the External Bus Controller or an on-chip I/O device (ACLC or SIO). • Memory Transfer Mode (DMCCRn.EXTRQ = “0”) Either copies data between memory devices or fills data in memory. Table 8.3.1 DMA Controller Transfer Modes DMA Controller Transfer Mode DMCCRn EXTREQ PCFG DMASEL DMCCRn SNGAD DMSAR DMDAR Ref. External I/O (Single Address) 1 0 1 √ ⎯ 8.3.3 8.3.7 External I/O (Dual Address) 1 0 0 √ √ 8.3.3 8.3.8 Internal I/O (SIO) 1 1 0 √ √ 8.3.4 8.3.8 Memory-Memory Copy 0 ⎯ 0 √ √ 8.3.4 8.3.8 DMAC0 Fill Memory 0 ⎯ 1 √ ⎯ 8.3.6 8.3.7 Internal I/O (ACLC) 1 ⎯ 0 √ √ 8.3.4 8.3.8 Memory-Memory Copy 0 ⎯ 0 √ √ 8.3.4 8.3.8 DMAC1 Fill Memory 0 ⎯ 1 √ ⎯ 8.3.6 8.3.7 |
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