PM0020 datasheet(81/87 Pages) STMICROELECTRONICS

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PM00020

ISC logic description

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12.5.19

ISC_READ

Description:

Read a sector (auto-incremented address)

Requirement:

Part is in ISC mode, unsecured

ISC_Data

Shift-In:

64 bits don't care

Shift-Out:

64 bits data

Mode:

ISC

Security:

Blocked

In step 4, 5uS is needed to allow time for capturing 64 bits.

In order to read a different sector, steps 0-7 need to be repeated. Address auto-increment

does not go to the next sector. When the end of sector is reached, continuing to repeat the

steps 4 & 5, the reading flow starts again from the beginning of the sector.

Note: The ISC_READ instruction can be used for reading the main and secondary Flash

sectors and OTP. It cannot be used for reading the Configuration bits, the User code and the

OTP Lock bit.

Table 47.

ISC_READ sequence

Step

Tap activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_ADDRESS_SHIFT

DR-Scan

Shift in 8 bits sector address

IR-Scan

Load ISC_READ

Run-Test/Idle

Wait 5uS; data read; address

incremented

DR-Scan

Shift out 64 bits of data

Repeat steps 4 & 5 until end of

sector

IR-Scan

Load ISC_NOOP

Run-Test/Idle

End

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