HD6412350 Hitachi, HD6412350 Datasheet - Page 239

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

Bits 10 and 8—Reserved: Can be read or written to.
Bits 7 and 5—Data Transfer Master Enable (DTME): Together with the DTE bit, these bits
control enabling or disabling of data transfer on the relevant channel. When both the DTME bit
and the DTE bit are set to 1, transfer is enabled for the channel.
If the relevant channel is in the middle of a burst mode transfer when an NMI interrupt is
generated, the DTME bit is cleared, the transfer is interrupted, and bus mastership passes to the
CPU. When the DTME bit is subsequently set to 1 again, the interrupted transfer is resumed. In
block transfer mode, however, the DTME bit is not cleared by an NMI interrupt, and transfer is
not interrupted.
The conditions for the DTME bit being cleared to 0 are as follows:
The condition for DTME being set to 1 is as follows:
Bit 7—Data Transfer Master Enable 1 (DTME1): Enables or disables data transfer on channel
1.
Bit 7
DTME1
0
1
Bit 5—Data Transfer Master Enable 0 (DTME0): Enables or disables data transfer on channel
0.
Bit 5
DTME0
0
1
When initialization is performed
When NMI is input in burst mode
When 0 is written to the DTME bit
When 1 is written to DTME after DTME is read as 0
Description
Data transfer disabled. In burst mode, cleared to 0 by an NMI interrupt
Data transfer enabled
Description
Data transfer disabled. In normal mode, cleared to 0 by an NMI interrupt (Initial value)
Data transfer enabled
(Initial value)
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