TC9256AFG datasheet(3/34 Pages) TOSHIBA

3 / 34 page

TC9256, 57APG/AFG

2006-07-14

Pin Function

Pin No.

Symbol

Pin Name

Function

Circuit Diagram

Crystal oscillator

pins

Connects a 3.6 MHz, 4.5 MHz, 7.2 MHz

or 10.8 MHz crystal oscillator to supply

reference frequency and internal clock.

PERIOD

Period signal input

CLOCK

Clock signal input

DATA

Serial data

input/output

Serial I/O ports. These pins transfer data

to and from the controller to set divisors

and dividing modes, and to control the

general-purpose counter and

general-purpose I/O ports.

OT-1

OT-2

OT-3

(

⎯)

OT-4

General-purpose

output ports

N-channel open drain port pins, for such

uses as control signal output.

These pins are set to the OFF state when

power is turned on.

(On the TC9256APG and TC9256AFG,

OT-4 can be used as a CMOS output pin

by being switched with DO2.)

(

⎯)

I/O-5/CLK

(

⎯)

I/O-6

General-purpose I/O

ports

The CMOS structure allows free use of

these ports for input or output. Ports are

set for input when the power is turned on.

On the TC9257APG and TC9257AFG,

I/O-5 can be switched for use as a

system clock output pin.

(10)

AMIN

(11)

FMIN

Programmable

counter input

These pins input FM and AM band local

oscillator signals.. These pins feature

built-in amps. Connecting a capacitor

permits low-amplitude operation.

(13)

I/O-9 (-6)

/IFIN2

(14)

I/O-8 (-5)

/IFIN1

General-purpose I/O

ports

/General-purpose

counter frequency

measurement input

General-purpose I/O port input/output

pins. Can be switched for use as input

pins to measure general-purpose counter

frequencies. The frequency

measurement function has such uses as

measuring intermediate frequencies (IF).

These pins feature built-in amps.

Connecting a capacitor permits

low-amplitude operation.

Note: These pins are set for input when

power is turned on.

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