UPD6708 datasheet(32/72 Pages) NEC

32 / 72 page

µPD6708

Table 5-5. Slave Status after Execution of INIT Command

Bit

Value

Meaning

Bit 2

Unit is not locked.

Bit 0

Slave transmit buffer is empty.

<4> Slave transmission and broadcast reception are enabled.

<5> After the 2-byte command parameter (master address and condition setting code) have been read from the write

data buffer (WDB), WDB is cleared.

(2)

Example

When INIT command specifies that the master address is ‘012H’ and the condition setting are ‘communication in mode

1’ and ‘slave data transmission section operable’, the contents of WDB and CMR are as shown below.

5.2.2

SETSA command (command code: 0001)

(1)

Functions

<1> Slave address (12 bits) setting

The value for the slave address set by the SETSA command remains unchanged until the power is turned off or the

reset mode is entered.

<2> This command clears WDB after reading the 2-byte command parameter (slave address) from WDB.

(2)

Example

When SETSA command sets the slave address as ‘024H’, the contents of WDB and CMR are as shown below.

0000

0001

0010

0101

0100

0000

First Byte

Second Byte

Master Address

Condition

Setting Code

Third Byte

Fourth Byte

WDB

CMR

0000

0010

0100

0000

0100

0001

First Byte

Second Byte

Slave Address

Set to

0000

Third Byte

Fourth Byte

WDB

CMR

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