HD6412350 Hitachi, HD6412350 Datasheet - Page 311
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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For DTCE bit setting, use bit manipulation instructions such as BSET and BCLR. 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.
8.2.8
DTVECR is an 8-bit readable/writable register that enables or disables DTC activation by
software, and sets a vector number for the software activation interrupt.
DTVECR is initialized to H'00 by a reset and in hardware standby mode.
Bit 7—DTC Software Activation Enable (SWDTE): Enables or disables DTC activation by
software.
When clearing the SWDTE bit to 0 by software, write 0 to SWDTE after reading SWDTE set to 1.
Bit 7
SWDTE
0
1
Bits 6 to 0—DTC Software Activation Vectors 6 to 0 (DTVEC6 to DTVEC0): These bits
specify a vector number for DTC software activation.
The vector address is expressed as H'0400 + ((vector number) << 1). <<1 indicates a one-bit left-
shift. For example, when DTVEC6 to DTVEC0 = H'10, the vector address is H'0420.
Note: *
Bit
Initial value
R/W
DTC Vector Register (DTVECR)
A value of 1 can always be written to the SWDTE bit, but 0 can only be written after 1
is read.
Description
DTC software activation is disabled
[Clearing condition]
When the DISEL bit is 0 and the specified number of transfers have not ended
DTC software activation is enabled
[Holding conditions]
:
:
:
When the DISEL bit is 1 and data transfer has ended
When the specified number of transfers have ended
During data transfer due to software activation
SWDTE
R/(W)*
7
0
DTVEC6
R/W
6
0
DTVEC5
R/W
5
0
DTVEC4
R/W
4
0
DTVEC3
R/W
3
0
DTVEC2
R/W
2
0
DTVEC1
R/W
1
0
(Initial value)
DTVEC0
R/W
0
0
291
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