UPD784031A View Datasheet(PDF) - NEC => Renesas Technology

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Description

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UPD784031A

16-/8-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784031

9.5 Examples of Macro Service Applications

(1) Serial interface transmission

Transmission data storage buffer (memory)

Data n

Data n - 1

Data 2

Data 1

Internal bus

TxD

Transmission

shift register

TXS (SFR)

Transmission control

INTST

Each time a macro service request (INTST) is generated, the next transmission data is transferred from memory

to TXS. When data n (last byte) has been transferred to TXS (that is, once the transmission data storage buffer

becomes empty), a vectored interrupt request (INTST) is generated.

(2) Serial interface reception

Reception data storage buffer (memory)

Data n

Data n - 1

Data 2

Data 1

RxD

Internal bus

Reception buffer RXB (SFR)

Reception

shift register

Reception control

INTSR

Each time a macro service request (INTSR) is generated, reception data is transferred from RXB to memory.

When data n (last byte) has been transferred to memory (that is, once the reception data storage buffer becomes

full), a vectored interrupt request (INTSR) is generated.

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