UPD6708 datasheet(62/72 Pages) NEC

62 / 72 page

µPD6708

(4)

Processing in case of end during master reception return code (7H)

Note

To distinguish data from receive data (slave reception, broadcast reception) newly input in the next communication

frame, after reading RDB (inputting one serial clock pulse to SCK pin), STR should be read (inputting one serial

clock pulse to SCK pin) within the time shown below.

• When the next frame is mode 2

: Approx. 290

µs

• When the next frame is mode 1

: Approx. 400

µs

• When the next frame is mode 0

: Approx. 1580

µs

However, the above time limits for reading STR do not apply if this processing routine is executed in the reception

disabled state after executing the SETREV command.

The flowcharts for slave reception processing and broadcast reception processing are the same as for master reception

processing, and are therefore omitted here.

Start

Mre = 1 ?

Set master reception flag (Mre).

Mre

← 1

Note

Read RDB

←

number of master

receive data bytes

Read STR

RDB empty ?

Read RDB

Mre

← 0

End

Read slave address (higher 8 bits).

Read slave address (lower 4 bits)

and control bits.

Read number of master receive data bytes.

Read master receive data.

UPD6708 Datasheet(PDF) 62 Page - NEC