460
MRB—DTC Mode Register B
H'BC00 to H'BFFF
DTC
Bit
Initial value
Read/Write
7
CHNE
Undefined
—
6
DISEL
Undefined
—
5
CHNS
Undefined
—
4
—
Undefined
—
3
—
Undefined
—
2
—
Undefined
—
1
—
Undefined
—
0
—
Undefined
—
0 After a data transfer ends, the CPU interrupt is disabled
unless the transfer counter is 0
After a data transfer ends, the CPU interrupt is enabled
DTC Interrupt Select
1
0 DTC data transfer finished (waiting for activation)
DTC chain transfer (new register information is read,
and data transfer performed)
DTC Chain Transfer Enable
1
Reserved bits
(write 0)
DTC Chain Transfer Select
CHNE
0
Description
1
1
CHNS
—
0
1
No chain transfer (activation-standby
state entered at end of DTC data transfer)
Chain transfer every time
Chain transfer only when transfer counter = 0
SAR—DTC Source Address Register
H'BC00 to H'BFFF
DTC
Bit
Initial value
Read/Write
23
*
—
22
*
—
21
*
—
20
*
—
19
*
—
- - -
- - -
- - -
- - -
4
*
—
3
*
—
2
*
—
1
*
—
0
*
—
Specifies data transfer source address
*
: Undefined
Содержание H8S/2670
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