UPD784938 Datasheet, PDF (570/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

570
CHAPTER 23 INTERRUPT FUNCTIONS
Figure 23-22. Macro Service Data Transfer Processing Flow (Type A)
Macro service request
acknowledgment
Read contents of macro
service mode register
Determine channel type
Other
TYPE A
To other macro service processing
Read channel pointer contents (m)
Read MSC contents (n)
Calculate buffer address^Note
Read SFR pointer contents
Note 1-byte transfer: m-n-1
2-byte transfer: m-n × 2-1
Determine transfer direction
SFR → Memory
Memory → SFR
Read buffer contents, then transfer
read data to specified SFR
Specified SFR contents, then
transfer read data to buffer
MSC ← MSC-1
MSC = 0?
No
Yes
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