UPD6708 datasheet(37/72 Pages) NEC

37 / 72 page

µPD6708

(2)

Command setting conditions

The reception disabled state must be set and RDB emptied before setting the GETSTA command.

Caution With the IEBus, the lock function is provided to enable communication to run over a number of frames.

However, if a locked unit goes down without being unlocked, the locked unit is unable to receive any

further data. To avoid this situation, in a system which uses the lock function it is necessary to execute

the GETSTA command periodically to monitor the lock status (a unit lock is released by executing INIT

command).

5.2.8

SETREV command (command code: 0111)

(1)

Functions

<1> Set reception enabled/disabled status

• When reception status code is 00H

: Set to reception disabled status.

In the reception disabled status, bit 1 of the slave status is ‘1’, the slave receive buffer becomes virtually empty

and no longer exists, and slave reception and broadcast reception are no longer performed.

• When reception status code is 01H

: Set to reception enabled status.

When the prescribed conditions are met, slave reception and broadcast reception are performed.

The reception enabled status is also set when a command other than SETREV is executed.

<2> This command clears WDB after reading the 1-byte command parameter (reception status code) from WDB.

UPD6708 数据表(PDF) 37 Page - NEC