Renesas ZTAT H8S/2357F, Hardware Manual

Page: 216 / 1047

Rev.6.00 Oct.28.2004 page 188 of 1016
REJ09B0138-0600H
Bit 7—Data Transfer Master Enable 1 (DTME1): Enables or disables data transfer on channel 1.
Bit 7
DTME1
Description
0 Data transfer disabled. In burst mode, cleared to 0 by an NMI interrupt (Initial value)
1 Data transfer enabled
Bit 5—Data Transfer Master Enable 0 (DTME0): Enables or disables data transfer on channel 0.
Bit 5
DTME0
Description
0 Data transfer disabled. In normal mode, cleared to 0 by an NMI interrupt (Initial value)
1 Data transfer enabled
Bits 6 and 4—Data Transfer Enable (DTE): When DTE = 0, data transfer is disabled and the activation source selected
by the data transfer factor setting is ignored. If the activation source is an internal interrupt, an interrupt request is issued to
the CPU or DTC. If the DTIE bit is set to 1 when DTE = 0, the DMAC regards this as indicating the end of a transfer, and
issues a transfer end interrupt request to the CPU.
The conditions for the DTE bit being cleared to 0 are as follows:
•
When initialization is performed
•
When the specified number of transfers have been completed
•
When 0 is written to the DTE bit to forcibly abort the transfer, or for a similar reason
When DTE = 1 and DTME = 1, data transfer is enabled and the DMAC waits for a request by the activation source
selected by the data transfer factor setting. When a request is issued by the activation source, DMA transfer is executed.
The condition for the DTE bit being set to 1 is as follows:
•
When 1 is written to the DTE bit after the DTE bit is read as 0
Bit 6—Data Transfer Enable 1 (DTE1): Enables or disables data transfer on channel 1.
Bit 6
DTE1
Description
0 Data transfer disabled (Initial value)
1 Data transfer enabled
Bit 4—Data Transfer Enable 0 (DTE0): Enables or disables data transfer on channel 0.
Bit 4
DTE0
Description
0 Data transfer disabled (Initial value)
1 Data transfer enabled