h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 215

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

8.2.7
The DTC enable registers comprise eight 8-bit readable/writable registers, DTCERA to DTCERG
and DTCERI, with bits corresponding to the interrupt sources that can control enabling and
disabling of DTC activation. These bits enable or disable DTC service for the corresponding
interrupt sources.
The DTC enable registers are initialized to H'00 by a reset and in hardware standby mode.
Bit n—DTC Activation Enable (DTCEn)
A DTCE bit can be set for each interrupt source that can activate the DTC. The correspondence
between interrupt sources and DTCE bits is shown in table 8.4, together with the vector number
generated for each interrupt controller.
For DTCE bit setting, use bit manipulation instructions such as BSET and BCLR for reading and
writing. If all interrupts are masked, multiple activation sources can be set at one time by writing
data after executing a dummy read on the relevant register.
Bit n
DTCEn
0
1
Bit
Initial value
R/W
DTC Enable Registers (DTCER)
Description
DTC activation by this interrupt is disabled
[Clearing conditions]
•
•
DTC activation by this interrupt is enabled
[Holding condition]
When the DISEL bit is 0 and the specified number of transfers have not ended
:
:
:
When the DISEL bit is 1 and the data transfer has ended
When the specified number of transfers have ended
DTCE7
R/W
7
0
DTCE6
R/W
6
0
DTCE5
R/W
5
0
DTCE4
R/W
4
0
Rev. 5.00 Sep 22, 2005 page 189 of 1136
Section 8 Data Transfer Controller (DTC)
DTCE3
R/W
3
0
DTCE2
R/W
2
0
DTCE1
R/W
REJ09B0257-0500
1
0
(Initial value)
DTCE0
(n = 7 to 0)
R/W
0
0