HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 333

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

8.2.7
The DTC enable registers comprise six 8-bit readable/writable registers, DTCERA to DTCERF,
with bits corresponding to the interrupt sources that can activate the DTC. 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)
Bit n
DTCEn
0
1
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 8.5, together with the vector numbers
generated by the interrupt controller.
For DTCE bit setting, read/write operations must be performed using bit-manipulation instructions
such as BSET and BCLR. For the initial setting only, however, when multiple activation sources
are set at one time, it is possible to disable interrupts and write after executing a dummy read on
the relevant register.
Bit
Initial value :
R/W
DTC Enable Registers (DTCER)
Description
[Clearing conditions]
•
•
[Holding condition]
When the DISEL bit is 0 and the specified number of transfers have not ended
DTC activation by this interrupt is disabled
DTC activation by this interrupt is enabled
:
:
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
0
4
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DTCE3
R/W
3
0
DTCE2
R/W
2
0
DTCE1
REJ09B0245-0400
R/W
1
0
(Initial value)
(n = 7 to 0)
DTCE0
R/W
0
0