HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 214

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

Bit 7—Data Transfer Enable (DTE): Together with the DTME bit in DTCRB, this bit enables or
disables data transfer on the channel. When the DTME and DTE bits are both set to 1, the channel
is enabled. If auto-request is specified, data transfer begins immediately. Otherwise, the channel
waits for transfers to be requested. When the specified number of transfers have been completed,
the DTE bit is automatically cleared to 0. When DTE is 0, the channel is disabled and does not
accept transfer requests. DTE is set to 1 by reading the register when DTE is 0, then writing 1.
Bit 7
DTE
0
1
If DTIE is set to 1, a CPU interrupt is requested when DTE is cleared to 0.
Bit 6—Data Transfer Size (DTSZ): Selects the data size of each transfer.
Bit 6
DTSZ
0
1
Bit 5—Source Address Increment/Decrement (SAID) and Bit 4—Source Address
Increment/Decrement Enable (SAIDE): These bits select whether the source address register
(MARA) is incremented, decremented, or held fixed during the data transfer.
Bit 5
SAID
0
1
Description
Data transfer is disabled (DTE is cleared to 0 when the specified number
of transfers have been completed)
Data transfer is enabled
Description
Byte-size transfer
Word-size transfer
Bit 4
SAIDE
0
1
0
1
Description
MARA is held fixed
MARA is incremented after each data transfer
• If DTSZ = 0, MARA is incremented by 1 after each transfer
• If DTSZ = 1, MARA is incremented by 2 after each transfer
MARA is held fixed
MARA is decremented after each data transfer
• If DTSZ = 0, MARA is decremented by 1 after each transfer
• If DTSZ = 1, MARA is decremented by 2 after each transfer
200
(Initial value)
(Initial value)
(Initial value)