NEC PD78214 - Manual (Page 354)

325
Chapter 12 Interrupt Functions
12
Fig. 12-18 Flow of Data Transfer by Macro Service (Type A)
Accepts macro service request
Read contents of macro service mode register
Identify channel type
Read channel pointer contents (m)
Read MSC contents (n)
Buffer address calculation m – n
Identify transfer direction
Read contents of buffer and transfer read data
to specified SFR
MSC = n – 1
MSC = 0?
Vectored interrupt request occurs.
End
Read specified SFR contents and transfer read
data to buffer
Reset interrupt request flag
End
No
Yes
Memory →SFR
SFR →memory
TYPE A
Other factors
To other macro service processing