HC705C9AGRSSLASHD datasheet(55/157 Pages) NXP

номер детали	HC705C9AGRS/D

подробное описание детали	General Release Specification

PDF	157 Pages

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производитель	NXP [NXP Semiconductors]

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General Release Specification

MC68HC05C9A Compatible COP

MC68HC705C9A — Rev. 2.0

Resets

5.6.1 C9A COP Reset Register

This write-only register, shown in Figure 5-4, is used to reset the COP.

The sequence required to reset the COP timer is as follows:

•

Write $55 to the COP reset register

•

Write $AA to the COP reset register

Both write operations must occur in the order listed, but any number of

instructions may be executed between the two write operations provided

that the COP does not time out between the two writes. The elapsed

time between software resets must not be greater than the COP timeout

period. If the COP should time out, a system reset will occur and the

device will be re-initialized in the same fashion as a power-on reset or

reset.

Reading this register does not return valid data.

$001D

Bit 7

6543

Bit 0

Read:

Write:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reset:

00000

= Unimplemented

Figure 5-4. COP Reset Register (COPRST)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705C9AGRS/D датащи(PDF) 55 Page - NXP Semiconductors