348
Bit 2—Address Error Flag Bit (AE): Indicates that an address error occurred by the DMAC. If
this bit is set during data transfer, transfers on all channels are suspended. The CPU cannot write
1 to this bit. This bit can only be cleared by writing 0 after reading 1.
Bit 2: AE
Description
0
No DMAC address error; DMA transfer is enabled
(Initial value)
Clearing conditions: Writing 0 to AE after reading AE = 1
Power-on reset, manual reset
1
DMAC address error; DMA transfer is disabled
This bit is set by occurrence of a DMAC address error
Bit 1—NMI Flag Bit (NMIF): Indicates that an NMI is input. This bit is set regardless of whether
the DMAC is in the operating or halted state. The CPU cannot write 1 to this bit. Only 0 can be
written to clear this bit after 1 is read.
Bit 1: NMIF
Description
0
No NMI input; DMA transfer is enabled
(Initial value)
Clearing conditions: Writing 0 to NMIF after reading NMIF = 1
Power-on reset, manual reset
1
NMI input; DMA transfer is disabled
This bit is set by occurrence of an NMI interrupt
Bit 0—DMA Master Enable Bit (DME): Enables or disables the DMAC on all channels. If the
DME bit and the DE bit corresponding to each channel in CHCR are set to 1, transfer is enabled
on the corresponding channel. If this bit is cleared during transfer, transfer on all the channels will
be terminated.
Even if the DME bit is set, transfer is not enabled if the TE bit is 1 or the DE bit is 0 in CHCR, or
the NMIF or AE bit is 1 in DMAOR.
Bit 0: DME
Description
0
DMA transfer disabled on all channels
(Initial value)
1
DMA transfer enabled on all channels
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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