TC74A23F datasheet(7/20 Pages) TOSHIBA

No de pièce	TC74A23F

Description	Toshiba CMOS Digital Integrated Circuit Silicon Monolithic

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Fabricant	TOSHIBA [Toshiba Semiconductor]

Site Internet	http://www.semicon.toshiba.co.jp/eng

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TC94A23F

2002-02-06

7

Number

Symbol

Pin Name

Function and Operation

Remarks

21~24

P1-0~P1-3

I/O port 1

4-bit CMOS I/O port.

Input/output can be set for each bit by

program.

The pins can be set to be pulled-up or

pulled-down by program. Thus, they can be

used as key input pins. When the pins are set

to I/O port input, Clock Stop mode and Wait

mode can be released, according to the

change in input to the pins.

25

P3-0

I/O port 3

26~28

P3-1/ADin1

~

P3-3/ADin3

I/O port 3

/A/D analog voltage

input

29

P4-0/ADin4

/BUZR

I/O port 4

/A/D analog voltage

input/buzzer output

5-bit CMOS I/O port.

Input/output can be set for each bit by

program.

P3-1 and P4-0 pins are also used as built-in

6-bit 4-channel A/D converter analog input

pins.

The built-in A/D converter uses successive

approximation. The conversion time is 6

instruction cycles (280

ms) when the 75 kHz

crystal oscillator is used; 198

ms when the 4.5

MHz crystal oscillator is used; 180

ms when

the 16.9344 MHz crystal oscillator is used.

A/D analog input can be set for each pin by

program. The internal power supply (MVDD) is

used as the reference voltage.

The P4-0 pin is also used as the buzzer

output pin.

One of four frequencies: 0.75, 1, 1.5, and 3

kHz, can be selected for buzzer output. The

buzzer is output at the selected frequency in

one of four modes: Continuous, single-shot,

10 Hz intermittent, and 10 Hz intermittent at 1

Hz interval.

Settings for the A/D converter and buzzer,

and their control can be performed by

program.

33

P2-0/EMPHin

34

P2-1/ HSO in

35

P2-2/LRCKin

36

P2-3/DATAin

I/O port 2

/1-bit DAC input

37

IN1/BCKin

89

IN2/ (VPP)

General-purpose

input port/1-bit DAC

input (VPP input)

I/O port 2 is a 4-bit CMOS I/O port.

IN1 and IN2 are a 2-bit general-purpose input

port.

Input/output can be set for each bit of I/O port

2 by program.

I/O port 2 and the IN1 pins can be switched to

1-bit DAC input pins by the CD command to

support shock-proofing. In this case, the I/O

port must be set to input.

With the OTP version, the IN2 pin is also used

as the program power supply pin.

MVDD

RIN1

MVDD

To A/D

converter

Input

instruction

MVDD

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