HD6432646 Hitachi, HD6432646 Datasheet - Page 245
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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Software Activation: An example is shown in which the DTC is used to transfer a block of 128
bytes of data by means of software activation. The transfer source address is H'1000 and the
destination address is H'2000. The vector number is H'60, so the vector address is H'04C0.
[1] Set MRA to incrementing source address (SM1 = 1, SM0 = 0), incrementing destination
[2] Set the start address of the register information at the DTC vector address (H'04C0).
[3] Check that the SWDTE bit in DTVECR is 0. Check that there is currently no transfer activated
[4] Write 1 to the SWDTE bit and the vector number (H'60) to DTVECR. The write data is H'E0.
[5] Read DTVECR again and check that it is set to the vector number (H'60). If it is not, this
[6] If the write was successful, the DTC is activated and a block of 128 bytes of data is transferred.
[7] After the transfer, an SWDTEND interrupt occurs. The interrupt handling routine should clear
address (DM1 = 1, DM0 = 0), block transfer mode (MD1 = 1, MD0 = 0), and byte size (Sz =
0). The DTS bit can have any value. Set MRB for one block transfer by one interrupt (CHNE =
0). Set the transfer source address (H'1000) in SAR, the destination address (H'2000) in DAR,
and 128 (H'8080) in CRA. Set 1 (H'0001) in CRB.
by software.
indicates that the write failed. This is presumably because an interrupt occurred between steps
3 and 4 and led to a different software activation. To activate this transfer, go back to step 3.
the SWDTE bit to 0 and perform other wrap-up processing.
211
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