UPD6708 datasheet(31/72 Pages) NEC

31 / 72 page

µPD6708

(2)

Read command

The command code of the read command is shown in Table 5-3.

Table 5-3. Command Code of Read Command

Command Code

Data Placed in RDB after Command Execution

Command Name

(Lower 4 Bits of

CMR)

First Byte

Second Byte

GETSTA

0110

Lock status

Address of locked unit (12 bits)

Remark

With a read command, the command execution result is placed in RDB, and therefore it is performed in the

reception disabled state.

5.2

Communication Control Command Functions

5.2.1

INIT command (command code: 0000)

(1)

Functions

<1> Unit address setting

This command sets the unit address (12 bits), The unit address will be used as the master address when a unit is

communicating as the master unit, and as the slave address when a unit is communicating as the slave.

<2> Condition setting

• The status of bit 4 of IEBus slave status is set.

Slave transmission block operation enabled, stopped (bit 4)

(Setting of use/non-use of the function that transmits data to the master unit)

• The communication mode to be used is set.

Table 5-4. Condition Setting Method

Condition Setting Code

Condition Setting Contents

Bits 3 and 2

Communication performed in mode 0

Communication performed in mode 1.

Communication performed in mode 2.

Undefined

Bit 1

Fixed at ‘0’

Bit 0

Slave transmission block stopped

Slave transmission block operational

The local-station address and condition setting contents set by INIT command retain their set values unless power

is turned off or reset mode is entered (see 4.3 “Reset Mode”).

<3> Slave status initialization

The slave status is initialized as shown in Table 5-5.

MSB

LSB

MSB

LSB MSB

LSB

UPD6708 数据表(PDF) 31 Page - NEC

UPD6708 数据表(HTML) 31 Page - NEC

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

数据表下载