HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 474

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

11.2.3
DMA transfer count registers 0 and 1 (TCR0 and TCR1) are 32-bit read/write registers that
specify the DMA transfer count. The lower 24 of the 32 bits are valid. The value is written as 32
bits, including the upper eight bits. The number of transfers is 1 when the setting is H'00000001,
16,777,215 when the setting is H'00FFFFFF and 16, 777,216 (the maximum) when H'00000000 is
set. During a DMA transfer, these registers indicate the remaining transfer count.
Set the initial value as the write value in the upper eight bits. These bits always read 0. Values are
retained in a reset, in standby mode, and when the module standby function is used. For 16-byte
transfers, set the count to 4 times the number of transfers. Operation is not guaranteed if an
incorrect value is set.
Initial value:
Initial value:
DMA Transfer Count Registers 0 and 1 (TCR0, TCR1)
R/W:
R/W:
Bit:
Bit:
R/W
31
—
23
—
0
R
R/W
30
—
22
—
0
R
R/W
29
—
21
—
0
R
28
—
…
…
…
…
0
R
R/W
27
—
—
0
R
3
R/W
26
—
—
0
R
2
R/W
25
—
—
0
R
1
R/W
24
—
—
0
R
0
459