NEC PD78214 - Manual (Page 355)

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PD78214 Sub-Series
(2) Macro service channel configuration
A channel pointer and a macro service counter (MSC) specify the addresses of transfer source and destination
buffers in the internal RAM (at FE00H through FEFFH). (See Fig. 12-19.)
The SFR to be accessed is predetermined for each interrupt request. (See Table 12-8.)
Fig. 12-19 Type A Macro Service Channel
Macro service buffer n MSC = n
Macro service buffer 2 MSC = 2
Macro service buffer 1 MSC = 1
Macro service counter
(MSC)
Mode register
Channel pointer ↓Higher address
↑Lower address
Macro service channel
Macro service control word
(Macro service buffer address) = (Channel pointer) – (Macro service counter)