4

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Timing Waveform

1.5V

1.7V

1.3V

(HIGH IMPEDANCE)

OE

THREE STATE

CONTROL

THREE STATE

OUTPUT

(Y0 - Y7)

OUT

(Y0 - Y7)

MUX SEL

(S0 - S1)

DATA

(S0 - D7)

INST

(I0 - I1)

CLOCK

(CLK)

TABLE 1. INSTRUCTION CONTROL

I1

I0

HSP9520

HSP9521

00

01

10

1

1

All Registers Hold

All Registers Hold

A1

A2

B1

B2

A1

A2

B1

B2

A1

A2

B1

B2

A1

A2

B1

B2

A1

A2

B1

B2

A1

A2

B1

B2

TABLE 2. REGISTER SELECT

S1

S0

HSP9520 OR HSP9521

00

B2

01

B1

10

A2

11

A1

HSP9520, HSP9521