H8SSLASH2214 datasheet(266/936 Pages) RENESAS

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Section 7 DMA Controller

Rev.4.00 Sep. 18, 2008 Page 206 of 872

REJ09B0189-0400

Bit 1—Write Enable 0B (WE0B): Enables or disables writes to all bits in DMACR0B, bits 9, 5,

and 1 in DMABCR, and bit 4 in DMATCR.

Bit 1

WE0B

Description

Writes to all bits in DMACR0B, bits 9, 5, and 1 in DMABCR, and bit 4 in DMATCR

are disabled

(Initial value)

Writes to all bits in DMACR0B, bits 9, 5, and 1 in DMABCR, and bit 4 in DMATCR

are enabled

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

Writes to all bits in DMACR0A, and bits 8, 4, and 0 in DMABCR are disabled

(Initial value)

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.

H8S/2214 Scheda tecnica(PDF) 266 Page - Renesas Technology Corp