r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 641

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

14.3.6
TCRB is 32-bit readable/writable registers. Data to be written from the CPU to TCR is also
written to TCRB. While the HE function is used, TCRB are used as the initial value hold registers
to detect HE. Also, TCRB specify the number of DMA transfers which are set in TCR in repeat
mode. TCRB specify the number of DMA transfers and are used as transfer count counters in
reload mode.
In reload mode, the lower 16 bits operate as transfer count counters, values of SAR and DAR are
updated after the value of the lower 16 bits became 0, and then the value of the upper 16 bits of
TCRB are loaded to the lower 16 bits. In upper 16 bits, set the number of transfers which starts
reloading. In reload mode, the same number of transfers should be set in both upper and lower 16
bits. Also, set the HIE bit in CHCR to 0 and do not use the HE function.
The initial value of TCRB is undefined.
Initial value:
Initial value:
R/W:
R/W:
Bit:
Bit:
DMA Transfer Count Registers (TCRB0 to TCRB3)
R/W
31
15
—
—
R
R/W
—
—
30
14
R
R/W
—
—
29
13
R
R/W
—
—
28
12
R
R/W
—
—
27
11
R
R/W
—
—
26
10
R
R/W
—
—
25
R
9
R/W
—
—
24
Section 14 Direct Memory Access Controller (DMAC)
R
8
TCRB
TCRB
R/W
R/W
—
—
23
7
Rev. 1.00 Oct. 01, 2007 Page 575 of 1956
R/W
R/W
—
—
22
6
R/W
R/W
—
—
21
5
R/W
R/W
—
—
20
4
R/W
R/W
—
—
19
3
REJ09B0256-0100
R/W
R/W
—
—
18
2
R/W
R/W
—
—
17
1
R/W
R/W
—
—
16
0