HD6413007F20 Datasheet, PDF (230/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

7. DMA Controller
• ETCRB
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
Block transfer counter
In block transfer mode, ETCRAH functions as an 8-bit block size counter. ETCRAL holds the
initial block size. ETCRAH is decremented by 1 each time one byte or word is transferred.
When the count reaches H'00, ETCRAH is reloaded from ETCRAL. Blocks consisting of an
arbitrary number of bytes or words can be transferred repeatedly by setting the same initial
block size value in ETCRAH and ETCRAL.
In block transfer mode ETCRB functions as a 16-bit block transfer counter. ETCRB is
decremented by 1 each time one block is transferred. The transfer ends when the count reaches
H'0000.
The ETCRs are not initialized by a reset or in standby mode.
Rev.5.00 Sep. 12, 2007 Page 200 of 764
REJ09B0396-0500