SH7059 Datasheet, PDF (227/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

10. Direct Memory Access Controller (DMAC)
• Bit 1—Transfer End (TE): This bit is set to 1 after the number of data transfers specified by DMATCR. At this time, if
the IE bit is set to 1, an interrupt request is generated.
If data transfer ends before TE is set to 1 (for example, due to an NMI or address error, or clearing of the DE bit or
DME bit of DMAOR) TE is not set to 1. With this bit set to 1, data transfer is disabled even if the DE bit is set to 1.
Bit 1: TE
0
1
Description
DMATCR-specified number of transfers not completed
[Clearing condition]
0 write after TE = 1 read, power-on reset, standby mode
DMATCR-specified number of transfers completed
(Initial value)
• Bit 0—DMAC Enable (DE): DE enables operation in the corresponding channel.
Bit 0: DE
0
1
Description
Operation of the corresponding channel disabled
Operation of the corresponding channel enabled
(Initial value)
Transfer is initiated if this bit is set to 1 when auto-request is specified (RS4–RS0 settings). With an on-chip module
request, when a transfer request occurs after this bit is set to 1, transfer is initiated. If this bit is cleared during a data
transfer, transfer is suspended.
If the DE bit has been set, but TE = 1, then if the DME bit of DMAOR is 0, and the NMIF or AE bit of DMAOR is 1, the
transfer enable state is not entered.
10.2.5 DMAC Operation Register (DMAOR)
Bit:
15
14
13
12
11
10
9
8
—
—
—
—
—
—
—
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
Bit:
7
6
5
4
3
—
—
—
—
—
Initial value:
0
0
0
0
0
R/W:
R
R
R
R
R
Note: * Only a 0 write is valid after 1 is read at the AE and NMIF bits.
2
AE
0
R/(W)*
DMAOR is a 16-bit readable/writable register that controls the overall operation of the DMAC.
Register values are initialized to H'0000 by a power-on reset and in standby mode.
• Bits 15–3—Reserved: These bits are always read as 0. The write value should always be 0.
1
NMIF
0
R/(W)*
0
DME
0
R/W
Rev.3.00 Mar. 12, 2008 Page 137 of 948
REJ09B0177-0300