HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 162

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 9 Direct Memory Access Controller (DMAC)
9.2.3
DMA transfer count registers 0–3 (DMATCR0–DMATCR3) are 24-bit read/write registers that
specify the transfer count for the channel (byte count, word count, or longword count). Specifying
a H'000001 gives a transfer count of 1, while H'000000 gives the maximum setting, 16,777,216
transfers.
The upper 8 bits of DMATCR always read 0. The write value, also, should always be 0.
The value after power-on resets and in standby mode is undefined.
Always write 0 to the upper 8 bits of a DMATCR.
Rev. 5.00 Jan 06, 2006 page 142 of 818
REJ09B0273-0500
Initial value:
Initial value:
Initial value:
Initial value:
DMA Transfer Count Registers 0–3 (DMATCR0–DMATCR3)
R/W:
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
Bit:
R/W
R/W
R/W
31
23
15
—
—
—
—
R
0
7
R/W
R/W
R/W
30
22
14
—
—
—
—
R
0
6
R/W
R/W
R/W
29
21
13
—
—
—
—
R
0
5
R/W
R/W
R/W
28
20
12
—
—
—
—
R
0
4
R/W
R/W
R/W
27
19
11
—
—
—
—
R
0
3
R/W
R/W
R/W
26
18
10
—
—
—
—
R
0
2
R/W
R/W
R/W
25
17
—
—
—
—
R
0
9
1
R/W
R/W
R/W
24
16
—
—
—
—
R
0
8
0