h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 218
h8s-2138
Manufacturer Part Number
h8s-2138
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2138.pdf
(1061 pages)
- Current page: 218 of 1061
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Section 7 Data Transfer Controller [H8S/2138 Group]
7.2.2
MRB is an 8-bit register that controls the DTC operating mode.
Bit 7—DTC Chain Transfer Enable (CHNE): Specifies chain transfer. In chain transfer,
multiple data transfers can be performed consecutively in response to a single transfer request.
With data transfer for which CHNE is set to 1, there is no determination of the end of the specified
number of transfers, clearing of the interrupt source flag, or clearing of DTCER.
Bit 7
CHNE
0
1
Bit 6—DTC Interrupt Select (DISEL): Specifies whether interrupt requests to the CPU are
disabled or enabled after a data transfer.
Bit 6
DISEL
0
1
Bits 5 to 0—Reserved: In the H8S/2138 Group these bits have no effect on DTC operation, and
should always be written with 0.
Rev. 4.00 Jun 06, 2006 page 164 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
DTC Mode Register B (MRB)
Description
End of DTC data transfer (activation waiting state is entered)
DTC chain transfer (new register information is read, then data is transferred)
Description
After a data transfer ends, the CPU interrupt is disabled unless the transfer counter is
0 (the DTC clears the interrupt source flag of the activating interrupt to 0)
After a data transfer ends, the CPU interrupt is enabled (the DTC does not clear the
interrupt source flag of the activating interrupt to 0)
CHNE
Unde-
fined
—
7
DISEL
Unde-
fined
—
6
Unde-
fined
—
—
5
Unde-
fined
—
—
4
Unde-
fined
—
—
3
Unde-
fined
—
—
2
Unde-
fined
—
—
1
Unde-
fined
—
—
0
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