PM0020 datasheet(79/87 Pages) STMICROELECTRONICS

79 / 87 page

PM00020

ISC logic description

79/87

During DR-Scan of step 4, the 64th bit is reserved and has to be “1” to ensure correct

operation of the device.

12.5.17

ISC_PROGRAM_UC

Description:

Program User-Code

Requirement:

Part is in ISC mode, unsecured part

Usercode

Shift-In:

32 bits User-Code data

Shift-Out:

32 bits don't care

Mode:

ISC

Security:

Blocked

Programming of User-Code does not require address.

After step 6, if USERCODE instruction is loaded, the correct latest User-Code should be

shifted out.

12.5.18

ISC_PROGRAM_SECURITY

Description:

Program security bit

Requirement:

Part is in ISC mode, unsecured part

ISC_Default

Shift-In:

8 bits don't care

Shift-Out:

8 bits status

Mode:

ISC

Security:

Blocked

Table 45.

ISC_PROGRAM_UC sequence

Step

Tap activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_PROGRAM_UC

DR-Scan

Shift in User-Code (32 bits)

Run-Test/Idle

User-Code program starts

Begin polling

IR-Scan

Load ISC-NOOP

DR-Scan

Shift out status

Repeat step 5 until ready = 1

Run-Test/Idle

End

PM0020 Datasheet(PDF) 79 Page - STMicroelectronics

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