Hitachi H8/3048 Hardware Manual page 235

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Start
(DTE = DTME = 1)
Transfer requested?
Get bus
Read from MARA address
MARA = MARA + 1
Write to MARB address
MARB = MARB + 1
ETCRAH = ETCRAH – 1
ETCRAH = H'00
Release bus
ETCRAH = ETCRAL
MARB = MARB – ETCRAL
ETCRB = ETCRB – 1
ETCRB = H'0000
Clear DTE to 0 and end transfer
a. DTSZ = TMS = 0
SAID = DAID = 0
SAIDE = DAIDE = 1
Figure 8-11 Block Transfer Mode Flowcharts (Examples)
No
Yes
No
Yes
No
Yes
221
Start
(DTE = DTME = 1)
Transfer requested?
Yes
Get bus
Read from MARA address
MARA = MARA + 1
Write to MARB address
ETCRAH = ETCRAH – 1
ETCRAH = H'00
Yes
Release bus
ETCRAH = ETCRAL
ETCRB = ETCRB – 1
ETCRB = H'0000
Yes
Clear DTE to 0 and end transfer
b. DTSZ = TMS = 0
SAID = 0
SAIDE = 1
DAIDE = 0
No
No
No