HD6473032F16 Datasheet, PDF (229/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 8 DMA Controller
8.3.2 I/O Address Registers (IOAR)
The I/O address registers (IOARs) are not used in full address mode.
8.3.3 Execute Transfer Count Registers (ETCR)
An execute transfer count register (ETCR) is a 16-bit readable/writable register that specifies the
number of transfers to be executed. The functions of these registers differ between normal mode
and block transfer mode.
• Normal mode
ETCRA
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Initial value
Read/Write
Undetermined
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Transfer counter
ETCRB: Is not used in normal mode.
In normal mode ETCRA functions as a 16-bit transfer counter. The count is decremented by 1
each time one transfer is executed. The transfer ends when the count reaches H'0000. ETCRB
is not used.
Rev. 3.00 Mar 21, 2006 page 199 of 814
REJ09B0302-0300