HC705E5GRSSLASHD datasheet(104/148 Pages) NXP

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Synchronous Serial Interface (SSI)

General Release Specification

MC68HC705E5 — Rev. 1.0

Synchronous Serial Interface (SSI)

12.4.3 SSI Data Register

This register is located at address $000C and is both the transmit and

receive data register. This system is not double buffered but writes to

this register during transfers are masked and will not destroy the

previous contents. The SDR can be read at any time but if a transfer is

in progress the results may be ambiguous. This register should only be

written to when the SSI is enabled (SE = 1).

12.5 SSI During Stop Mode

In stop mode, the SSI halts operation. The SDIO and SCK pins will

maintain their states.

If the SSI was nearing completion of a transfer when stop mode is

entered, it might be possible for the SSI to generate an interrupt request

and cause the processor to immediately exit stop mode. To prevent this

occurrence, the programmer should ensure that all transfers are

complete before entering stop mode.

If the SSI is configured to slave mode, then further care should be taken

in entering stop mode. In slave mode, the SCK pin will still accept a clock

from an external master, allowing potentially unwanted transfers to take

place and power consumption to be increased. Note that the SSI will not

generate interrupt requests in this situation. However, on exiting stop

mode through some other means, the SF flag may be found to be set. If,

at this point, SIE is also set, an interrupt request will be generated.

NOTE:

To avoid these potential problems, it is safer to disable the SSI

completely (SE = 0) before entering stop mode.

Address:

$000C

Bit 7

654321

Bit 0

Read:

Write:

Reset:

Reset Results Unknown

Figure 12-6. SSI Data Register (SDR)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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