HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 180

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

7.2.8
DTVECR enables or disables DTC activation by software, and sets a vector number for the
software activation interrupt.
7.3
The DTC is activated by an interrupt request or by a write to DTVECR by software. The interrupt
request source to activate the DTC is selected by DTCER. At the end of a data transfer (or the last
consecutive transfer in the case of chain transfer), the interrupt flag that became the activation
source or the corresponding DTCER bit is cleared. The activation source flag, in the case of RXI0,
for example, is the RDRF flag in SCI_0.
When an interrupt has been designated as a DTC activation source, the existing CPU mask level
and interrupt controller priorities have no effect. If there is more than one activation source at the
same time, the DTC operates in accordance with the default priorities. Figure 7.2 shows a block
Rev. 2.0, 08/02, page 140 of 788
Bit
7
6
5
4
3
2
1
0
Bit Name
SWDTE
DTVEC6
DTVEC5
DTVEC4
DTVEC3
DTVEC2
DTVEC1
DTVEC0
DTC Vector Register (DTVECR)
Activation Sources
Initial Value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
DTC Software Activation Enable
Setting this bit to 1 activates DTC. Only 1 can always be
written to this bit. 0 can be written to after reading 1
from this bit.
[Clearing conditions]
[Holding conditions]
DTC Software Activation Vectors 6 to 0
These bits specify a vector number for DTC software
activation.
The vector address is expressed as H'0400 + (vector
number
H'10, the vector address is H'0420. When the SWDTE
bit is 0, these bits can be written to.
When the DISEL bit is 0 and the specified number of
transfers have not ended.
When 0 is written to the DISEL bit after a software-
activated data transfer end interrupt (SWDTEND)
request has been sent to the CPU.
When the DISEL bit is 1 and data transfer has
ended
When the specified number of transfers have ended.
During data transfer activated by software
2). For example, when DTVEC6 to DTVEC0 =