Motorola MC68328 Informações Técnicas descarregar pdf (Página 24)

3-6

FLEX Alphanumeric Chip MC68175 Interface

Software Development

FLEX System Software

Figure 3-3

FLEX Alphanumeric Chip IC Checksum Flowchart

Note:

On power-up, FLEX One-Way Stack software running on the host will attempt

to receive the Part ID packet and to send back the CheckSum packet to the

FLEX Alphanumeric Chip IC. If FLEX One-Way Stack does not seem to get out

of the interrupt handler (i.e., the FLEX IC keeps on asserting interrupt to the

host processor), it is reasonable to suspect that the FLEX IC has not received

the correct (expected) Checksum packet due to a hardware problem. The

RESET

FLEX Alphanumeric Chip

Checksum Register =

Chip Sends Part ID

Packet to Host

Chip Waits for SPI

Packet from Host

Checksum

Packet Data

Matches Checksum

Chip Sets Checksum

the Packet Data Bits with

the Checksum Register Bits

Packet?

Chip Enabled?

AA1423

Disables Itself

Part ID Value

FLEX Alphanumeric Chip

Disables Itself

Alphanumeric

FLEX

FLEX Alphanumeric Chip

Enables Itself

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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