Electronics America Computer Hardware User Manual

328
µ PD78214 Sub-Series
Fig. 12-21 Flow of Data Transfer by Macro Service (Type B)
Accepts macro service request
Read contents of macro service mode register
Identify channel type
Read channel pointer contents (m)
Identify transfer direction
Read data from SFR and write it to the memory
addressed by MP
MSC←MSC- 1
MSC = 0?
Vectored interrupt request
End
Read data from memory and write it to the SFR
specified by SFR pointer
Reset interrupt request flag
End
No
Yes
Memory→SFR
SFR→memory
TYPE B
Other factors
To other macro service processing
Select transfer source SFR by SFR pointer
Select transfer source memory by
macro service pointer (MP)
Increment MP