UPD784938 Datasheet, PDF (575/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 23 INTERRUPT FUNCTIONS
Figure 23-25. Macro Service Data Transfer Processing Flow (Type B)
Macro service request
acknowledgment
Read contents of macro service
mode register
Determine channel type
Other
TYPE B
Read channel pointer contents (m)
To other macro service processing
Determine transfer direction
SFR → Memory
Memory → SFR
Select transfer source SFR with
SFR pointer
Select transfer source memory with
macro service pointer (MS)
Read data from SFR, and write to
memory addressed by MP
Read data from memory, and write to
SFR specified by SFR pointer
Increment MP^Note
MSC ← MSC–1
MSC = 0?
Yes
Note 1-byte transfer: +1
2-byte transfer: +2
No
Clear (to 0) interrupt service
mode bit (ISM)
VCIE = 1?
No
Yes
Clear (to 0) interrupt request
flag (IF)
End
End
(Vectored interrupt request generation)
Preliminary User’s Manual U13987EJ1V0UM00
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