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MSM66P54-01

One-Time Programmable (OTP) Speech Synthesizer

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s MSM66P54 OTP Speech Synthesizer s––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

MSM66P54-01/-02 Pin Descriptions (Microcomputer Interface Mode) (Continued)

VDD

XT

XT

CMD

ST

CH

I6/SD

I5/SI

I4

I3/PORT1

I2/PORT0

I0, I1

VPP

PGM

–

Power supply.

I

Ceramic/Crystal Oscillator Input. A feedback resistor of 0.5~5M Ω between XT and XT is built in this pin. When using

an external clock, input to this pin.

O

Ceramic/Crystal Oscillator Output. When using an external clock, leave this pin open.

I

Command Input and Option Selection Control. Command and option input is enabled if the ST pin is set to a “L” level

when the CMD pin is “L.” Set the CMD pin to a “H” level when CMD is not used and when using the serial input

interface. This pin has an internal pull-up resistor.

I

Start. Speech synthesis starts with the fall of ST. With the rise of ST, addresses I0~I6 are latched inside the IC. Input

ST when the NAR status signal for Channels 1 and 2 is at a “H” level. A pull-up resistor is built into this pin.

I

Channel control signal. Channel 1 is selected at “H” level and Channel 2 is selected at “L” level. A pull-up resistor is

built into this pin.

I

Command Input 6/Serial Data Input. When the parallel input option is selected, this is a command and phrase input

pin. When the serial input option is selected, this pin becomes a serial data (command and address) input pin.

I

Command Input 5/Serial Clock Input. When the parallel input option is selected, this is a command and phrase input

pin. When the serial input option is selected, this pin becomes a serial clock input pin.

I

Command Input 4. When the parallel input option is selected, this is a command and phrase input pin. When the serial

input option is selected, leave this pin at a “L” level. A pull-up resistor is built into this pin.

I/O

Command Input 3/Port 1 Output. When the parallel input option is selected, this is a command and phrase input pin.

When the serial input option is selected, this pin becomes a port output pin. The output from this port can be varied

by command inputs from the microcomputer interface.

I/O

Command Input 2/Port 0 Output. When the parallel input option is selected, this is a command and phrase input pin.

When the serial input option is selected, this pin becomes a port output pin. The output from this port can be varied

by command inputs from the microcomputer interface.

I

Command Input 1/0. These are command and user specified phrase input pins when parallel input is optionally

selected. When the serial input option is selected, leave these pins at a “L” level. A pull-up resistor is built into these

inputs.

– Power-supply voltage for programming the on-chip OTP ROM. Set to a “H” level or open during normal operation.

I Interface pin for AR76-202 Speech Development System. Set to a “L” level or open during normal operation. This pin

has an internal pull-down resistor.

4-8

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