UPD784938 Datasheet, PDF(572/733 Page) NEC – 16-Bit Single-Chip Microcontrollers

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UPD784938 Datasheet, PDF (572/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

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CHAPTER 23 INTERRUPT FUNCTIONS

Figure 23-23. Type A Macro Service Channel

(a) 1-byte transfers

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Macro service

channel

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Macro service counter (MSC)

SFR pointer (SFRP)

Macro service buffer 1

Macro service buffer 2

MCS = 1

MCS = 2

Macro service buffer n MCS = n

High-order addresses

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Macro service ï£´

control word

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Channel pointer

Mode register

Low-order addresses

Macro service buffer address = (channel pointer) â (macro service counter) â 1

(b) 2-byte transfers

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channel

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Macro service counter (MSC)

SFR pointer (SFRP)

Macro service (high-order byte)

buffer 1 (low-order byte)

Macro service (high-order byte)

buffer 2 (low-order byte)

Macro service (high-order byte)

buffer n (low-order byte)

MCS = 1

MCS = 2

MCS = n

High-order addresses

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Macro service ï£´

control word

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Channel pointer

Mode register

Low-order addresses

Macro service buffer address = (channel pointer) â (macro service counter) Ã 2 â 1

572

Preliminary Userâs Manual U13987EJ1V0UM00

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