PM0020 datasheet(78/87 Pages) STMICROELECTRONICS

78 / 87 page

ISC logic description

PM00020

78/87

After the end of the sector is reached, the execution of the next ISC_PROGRAM instruction

is not allowed without shifting in a new address. This avoids the program flow starting again

at the beginning of the sector (by continuing to repeat steps 3 to 7) when the end of the

sector is reached. This control isn't active if the program flow is interrupted before reaching

the end of sector.

Note: 1 This is the only flow that can be used to program the OTP Lock bit

2 DR-Scan in step 4 is optional.

3 The Lock bit may be programmed only once and can never be erased.

Table 43.

OTP Lock Bit program flow

Step

Tap activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_ADDRESS_SHIFT

DR-Scan

Shift in the 8 bit OTP Lock bit

address - 76 Hex

IR-Scan

Load ISC_PROGRAM

DR-Scan

Shift in 64 bits don't care

Run-Test/Idle

Program starts

Wait for 50 us. Begin polling

IR-Scan

Load ISC-NOOP

DR-Scan

Shift out status

Repeat step 7 until ready = 1

Run-Test/Idle

End

Table 44.

Configuration (sector protect, CSx mapping and LVD configuration bits)

program flow

Step

Tap Activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_ADDRESS_SHIFT

2DR-Scan

Shift in the 8 bit Configuration

address - 50 Hex

IR-Scan

Load ISC_PROGRAM

4DR-Scan

Shift in 64 bits to be

programmed.

Run-Test/Idle

Program starts

Wait for 50 us. Begin polling

IR-Scan

Load ISC-NOOP

DR-Scan

Shift out status

Repeat step 7 until ready = 1

Run-Test/Idle

End

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