HD6413007F20 Datasheet, PDF (223/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

7. DMA Controller
(channel 0) or by a conversion-end interrupt from the A/D converter, and as a destination address
register otherwise.
The IOAR value is held fixed. It is not incremented or decremented when a transfer is executed.
The IOARs are not initialized by a reset or in standby mode.
7.2.3 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. These registers function in one way in I/O mode and idle
mode, and another way in repeat mode.
I/O mode and idle mode
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Initial value
Undetermined
Read/Write 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
In I/O mode and idle mode, ETCR functions as a 16-bit counter. The count is decremented by
1 each time one transfer is executed. The transfer ends when the count reaches H'0000.
Rev.5.00 Sep. 12, 2007 Page 193 of 764
REJ09B0396-0500