Hitachi SH7032 Hardware Manual page 220

Bit 3: TS
0
1
• Bit 2 (Interrupt Enable Bit (IE)): IE determines whether or not to request a CPU interrupt at the
end of a DMA transfer. When the IE bit is set to 1, an interrupt (DEI) request is sent to the
CPU when the TE bit is set. The IE bit is initialized to 0 by a reset and in standby mode.
Bit 2: IE
0
1
• Bit 1 (Transfer End Flag Bit (TE)): TE indicates that the transfer has ended. When a DMA
transfer ends normally and the value in the DMA transfer count register (TCR) becomes 0, the
TE bit is set to 1. This flag is not set if the transfer ends because of an NMI interrupt or address
error, or because the DE bit or the DME bit in the DMA operation register (DMAOR) was
cleared. To clear the TE bit, read 1 from it and then write 0.
When this flag is set, setting the DE bit to 1 does not enable a DMA transfer. The TE bit is
initialized to 0 by a reset and in standby mode.
Bit 1: TE
0
1
• Bit 0 (DMA Enable Bit (DE)): DE enables or disables DMA transfers. In auto-request mode,
the transfer starts when this bit or the DME bit in DMAOR is set to 1. The TE bit and the
NMIF and AE bits in DMAOR must be all cleared to 0. In external request mode or on-chip
supporting module request mode, the transfer begins when the DMA transfer request is
received from a device or on-chip supporting module, provided this bit and the DME bit are set
to 1. As with auto request mode, the TE bit and the NMIF and AE bits must be all cleared to 0.
The transfer can be stopped by clearing this bit to 0.
The DE bit is initialized to 0 by a reset and in standby mode.
Description
Byte (8 bits)
Word (16 bits)
Description
Interrupt request disabled
Interrupt request enabled
Description
DMA has not ended or was aborted
To clear TE, the CPU must read TE after it has been set to 1, then
write a 0 in this bit
DMA has ended normally
(Initial value)
(Initial value)
(Initial value)
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