h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 191

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

Normal Transfer Mode:
Block Transfer Mode:
Bit
31 to 24
23 to 0
Bit
31 to24
23 to 16
15 to 0
Bit Name
Bit Name


Initial
Value
All 0
Undefined R/W
Initial
Value
All 0
Undefined R/W
Undefined R/W
R/W

R/W

Description
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
24-Bit Transfer Counter
These bits specify the number of transfers (number of
bytes, word, or longwords). Setting H'000001 specifies
one transfer. Setting H'000000 means no specification
for the number of transfers, and the transfer counter
function is halted. In this case, there is no transfer end
interrupt by the transfer counter. Setting H'FFFFFF
specifies the maximum number of transfers, that is
16,777,215. During DMA transfer, this counter shows
the remaining number of transfers.
This counter can be read at all times. When reading
DMTCR for a channel on which DMA transfer
processing is in progress, a longword-size read must be
executed.
Reserved
These bits are always read as 0. The write value should
always be 0.
Block Size
These bits specify the block size (number of bytes,
words, or longwords) for block transfer. Setting H'01
specifies one as the block, while setting H'00 specifies
the maximum block size, that is 256. The register value
always indicates the specified block size.
16-Bit Transfer Counter
These bits specify the number of block transfers
(number of bytes, word, or longwords). Setting H'0001
specifies one block transfer. Setting H'0000 means no
specification for the number of transfers, and the
transfer counter function is halted. In this case, there is
no transfer end interrupt by the transfer counter. Setting
H'FFFF specifies the maximum number of block
transfers, that is 65,535. During DMA transfer, this
counter shows the remaining number of block transfers.
Rev. 2.00, 03/04, page 159 of 534