196
Chapter 6
DMA Functions (DMA Controller)
User’s Manual U16580EE3V1UD00
(3)
DMA transfer count registers 0 to 7 (DTCR0 to DTCR7)
The DTCRn register is an 8-bit register that set the transfer count for DMA channel n and stores
the remaining transfer count during DMA transfer (n = 0 to 7).
This register can be read or written in 8-bit units.
After reset the register content is undefined.
Figure 6-3:
DMA Transfer Count Registers 0 to 7 (DTCR0 to DTCR7)
Cautions: 1. The value set to the DTCRn register is decreased by each DMA transfer of
channel n. It does not keep the initial value after the DMA transfer ends.
Therefore, after DMA transfer end the DTCRn register values becomes 00H.
2. A DMA request becomes only effective after the DTCRn register was written.
Even if 00H (means a transfer count of 256) is the initial value, the DTRCn register
must be rewritten in order to enable a new DMA transfer.
Remark:
n = 0 to 7
After reset:
undefined
R/W
Address:
DTCR0 FFFFF320H, DTCR1 FFFFF322H
DTCR2 FFFFF324H, DTCR3 FFFFF326H
DTCR4 FFFFF328H, DTCR5 FFFFF32AH
DTCR6 FFFFF32CH, DTCR7 FFFFF32EH
7
6
5
4
3
2
1
0
DTCRn
DTCRn7
DTCRn6
DTCRn5
DTCRn4
DTCRn3
DTCRn2
DTCRn1
DTCRn0
DTCRn
7
DTCRn
6
DTCRn
5
DTCRn
4
DTCRn
3
DTCRn
2
DTCRn
1
DTCRn
0
Remaining DMA
Transfer Counts
0
0
0
0
0
0
0
0
256
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
0
2
0
0
0
0
0
0
1
1
3
·
·
·
·
·
·
1
1
1
1
1
1
1
0
254
1
1
1
1
1
1
1
1
255
Содержание MuPD70F3187
Страница 6: ...6 Preface User s Manual U16580EE3V1UD00 ...
Страница 16: ...16 User s Manual U16580EE3V1UD00 ...
Страница 28: ...28 User s Manual U16580EE3V1UD00 ...
Страница 32: ...32 User s Manual U16580EE3V1UD00 ...
Страница 84: ...84 Chapter 2 Pin Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 192: ...192 Chapter 5 Memory Access Control Function μPD70F3187 only User s Manual U16580EE3V1UD00 MEMO ...
Страница 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
Страница 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 970: ...970 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 ...
Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Страница 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
Страница 1052: ...1052 User s Manual U16580EE3V1UD00 ...
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