Section 7 Data Transfer Controller (DTC)
Rev. 1.00 Mar. 12, 2008 Page 184 of 1178
REJ09B0403-0100
7.8
Examples of Use of the DTC
7.8.1 Normal
Mode
An example is shown in which the DTC is used to receive 128 bytes of data via the SCI.
1. Set MRA to a fixed source address (SM1 = SM0 = 0), incrementing destination address (DM1
= 1, DM0 = 0), normal mode (MD1 = MD0 = 0), and byte size (Sz = 0). The DTS bit can have
any value. Set MRB for one data transfer by one interrupt (CHNE = 0, DISEL = 0). Set the
SCI, RDR address in SAR, the start address of the RAM area where the data will be received
in DAR, and 128 (H
′
0080) in CRA. CRB can be set to any value.
2. Set the start address of the register information at the DTC vector address.
3. Set the corresponding bit in DTCER to 1.
4. Set the SCI to the appropriate receive mode. Set the RIE bit in SCR to 1 to enable the
reception complete (RXI) interrupt. Since the generation of a receive error during the SCI
reception operation will disable subsequent reception, the CPU should be enabled to accept
receive error interrupts.
5. Each time the reception of one byte of data has been completed on the SCI, the RDRF flag in
SSR is set to 1, an RXI interrupt is generated, and the DTC is activated. The receive data is
transferred from RDR to RAM by the DTC. DAR is incremented and CRA is decremented.
The RDRF flag is automatically cleared to 0.
6. When CRA becomes 0 after 128 data transfers have been completed, the RDRF flag is held at
1, the DTCE bit is cleared to 0, and an RXI interrupt request is sent to the CPU. The interrupt
handling routine will perform wrap-up processing.
Summary of Contents for H8S Family
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Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
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Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
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Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
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Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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