UPD6708 datasheet(30/72 Pages) NEC

30 / 72 page

µPD6708

COMMUNICATION CONTROL COMMANDS

The operation conditions of the

µPD6708 can be controlled by giving it a command from the host controller.

After a communication using the appropriate procedure (see 8.3.2 “Communication control command processing

routine”), it is executed in a period in which communication is not being performed (standby state).

5.1

Overview of Communication Control Commands

Table 5-1. Overview of Communication Control Commands

Command Name

Description

INIT

(Initialize)

Sets local address and initializes.

SETSA

(Set slave address)

Sets the unit to communicate with.

MREQ1

(Master request 1)

Communicates as a master unit.

MREQ2

(Master request 2)

Continues in previous condition as the master unit and communicates.

ABORT

(Abort)

Aborts communications.

SETSD

(Set slave data)

Sets data for slave transmission.

GETSTA (Get status)

Reads communication status.

SETREV (Set receive)

Sets reception disabled state/enabled state.

(1)

Write command

The command codes and command parameters for the write commands are shown in Table 5-2.

Table 5-2. Command Codes and Command Parameters of Write Commands

Note

Only set when transmitting.

Caution Note that even if the host controller makes a mistake in setting the number of command parameter bytes,

an error message will not be returned by the

µPD6708, and command processing will be performed as

though it were a correctly set command.

Command Code

Command Parameters (WDB)

Command Name

(Lower 4 Bits of

CMR)

First Byte

Second Byte

Third Byte

Fourth Byte

INIT

0000

SETSA

0001

MREQ1

0010

MREQ2

0011

ABORT

0100

SETSD

0101

SETREV

0111

Control bits

Broad-

cast bits

Unit address

Condition

setting

code

Slave address

0000

Number of master

Master transmit

transmit data bytes Note

data (first byte) Note

data (second byte) Note

Number of slave

Slave transmit

transmit data bytes

data (first byte)

data (second byte)

data (third byte)

Reception status

code

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

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