µPD16835

21

(2) Standard data input

<First byte>

The first byte specifies the type of data and whether the EXP pin output is used, such as when the initial data

is input.

Table 7. First Byte Data Configuration

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Data

1

1

1

0

0 or 1 0 or 1 0 or 1 0 or 1

The EXP pin goes low (current sink) when the input data is “0”, and high (high-impedance state) when the input

data is “1”. Input “0” to bit D4.

<Second byte>

The second byte specifies the rotation direction of the

α channel, enables output of the α channel, and the number

α channel.

Bit D7 is used to specify the rotation direction. The rotation is in the forward direction (CW mode) when this bit

is “0”; it is in the reverse direction (CCW mode) when the bit is “1”.

Bit D6 is used to enable the output of the

α channel. The α channel enters the high-impedance state when this

bit is “0”; it is in conduction mode when the bit is “1”.

The number of pulses is set by bits D0 to D5. It is set by 6 bits in terms of software. However, the actual circuit

uses an 8-bit counter with the low-order two bits fixed to “0”. Therefore, the number of pulses that is actually

generated during start-up wait time + start-up drive wait (FF2) cycle is the number of pulses input

× 4. The number

of pulses can be set to a value in the range of 0 to 252, in units of four pulses.

Table 8. Second Byte Data Configuration (Standard data)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Data

0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1

Rotation direction

ENABLE

Number of pulses