MC68340 datasheet(300/441 Pages) FREESCALE

300 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

7- 5

.. .

. ...

DATA BUS

MUX

D15–D0

ADDRESS BUS

DATA BUS

DATA

D7–D0

SCLK

BAUD RATE

GENERATOR

LOGIC

CHANNEL B

FOUR-CHARACTER

RECEIVE BUFFER

TWO-CHARACTER

TRANSMIT BUFFER

RxDB

TxDB

RTSB

CTSB

CHANNEL A

FOUR-CHARACTER

RECEIVE BUFFER

TWO-CHARACTER

TRANSMIT BUFFER

RxDA

TxDA

RTSA

TxRDYA

CTSA

CONTROL

INTERNAL

CONTROL

LOGIC

RxRDYA

Figure 7-2. External and Internal Interface Signals

7.2.1 Crystal Input or External Clock (X1)

This input is one of two connections to a crystal or a single connection to an external

clock. A crystal or an external clock signal, at 3.6864 MHz, must be supplied when using

the baud rate generator. If a crystal is used, a capacitor of approximately 10 pF should be

connected from this signal to ground. If this input is not used, it must be connected to VCC

or GND. Refer to Section 10 Applications for an example of a clock driver circuit.

7.2.2 Crystal Output (X2)

This output is the additional connection to a crystal. If a crystal is used, a capacitor of

approximately 5 pF should be connected from this signal to ground. If an external TTL-

level clock is used on X1, the X2 output must be left open. Refer to Section 10

Applications for an example of a clock driver circuit.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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