UPD784938 Datasheet, PDF (580/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 23 INTERRUPT FUNCTIONS
Figure 23-29. Macro Service Data Transfer Processing Flow (Type C) (1/2)
Macro service request
acknowledgment
Read contents of macro service
mode register
Determine channel type
Other
TYPE C
Read channel pointer contents (m)
To other macro service processing
Read memory addressed by MPT
Automatic addition specified? ^Yes
No
Transfer data to compare register
Add data to compare register
Decrement MPT
Retain MPT?
Yes
No
No
Increment MPT?
Yes
Increment MPT^Note
Note 1-byte transfer: +1
2-byte transfer: +2
Read memory addressed by MPD
Transfer data to buffer register
No
Decrement MPD (–1)
Increment MPD?
Yes
Increment MPD (+1)
1
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Preliminary User’s Manual U13987EJ1V0UM00