I/O Address Registers (Ioar); Execute Transfer Count Registers (Etcr) - Renesas F-ZTAT H8 Series Hardware Manual

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
Initial value
Read/Write R/W
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.
14 13 12 11 10
R/W R/W R/W R/W R/W
9 8 7 6 5
Undetermined
R/W R/W R/W R/W R/W
Transfer counter
Rev. 3.00 Mar 21, 2006 page 199 of 814
Section 8 DMA Controller
4 3 2 1
R/W R/W R/W R/W R/W
REJ09B0302-0300
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