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HD6432351 Datasheet(PDF) 264 Page - Renesas Technology Corp |
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HD6432351 Datasheet(HTML) 264 Page - Renesas Technology Corp |
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264 / 1025 page  Section 7 DMA Controller (DMAC) Rev. 3.00 Sep 15, 2006 page 230 of 988 REJ09B0330-0300 Bit 0—Write Enable 0A (WE0A): Enables or disables writes to all bits in DMACR0A, and bits 8, 4, and 0 in DMABCR. Bit 0 WE0A Description 0 Writes to all bits in DMACR0A, and bits 8, 4, and 0 in DMABCR are disabled (Initial value) 1 Writes to all bits in DMACR0A, and bits 8, 4, and 0 in DMABCR are enabled Writes by the DTC to bits 15 to 12 (FAE and SAE) in DMABCR are invalid regardless of the DMAWER settings. These bits should be changed, if necessary, by CPU processing. In writes by the DTC to bits 7 to 4 (DTE) in DMABCR, 1 can be written without first reading 0. To reactivate a channel set to full address mode, write 1 to both Write Enable A and Write Enable B for the channel to be reactivated. MAR, IOAR, and ETCR are always write-enabled regardless of the DMAWER settings. When modifying these registers, the channel for which the modification is to be made should be halted. |
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