PM0020 datasheet(83/87 Pages) STMICROELECTRONICS

83 / 87 page

PM00020

ISC logic description

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12.5.21

ISC_BLANK_CHECK

Description:

Blank check single/multiple/all sectors

Requirement:

Part is in ISC mode, unsecured

ISC_Sector

Shift-In:

64 bits for sector to be blank checked

Shift-Out:

64 bits for blank sector data

Mode:

ISC

Security:

Blocked

Configuration Sector "blanked" means all the bit are not programmed and are read '0'

(default value).

OTP sector can be addressed in the SECTOR_REGISTER only for a blank check operation.

It cannot be erased. OTP "blanked" means it is not programmed and unlocked.

12.5.22

ISC_TEST_ENABLE

Description:This instruction is for factory testing of the device only.

12.5.23

TRST, LVD_RESET_ON and TEST-LOGIC-RESET

TRST pin, active low, resets the JTAG Tap Controller and synchronizes the JTAG state

machines to the same reset state on both the ARM MCU and the Flash Memory.

LVD_RESET_OUT pin, active low, detects a Low Voltage condition and resets the JTAG Tap

controller.

When TRST or LVD_RESET_OUT are active, the JTAG state machine jumps

asynchronously to the Test-Logic-Reset state, which activates an internal reset.

When a test logic reset is asserted while the Flash memory is in modify mode, the modify

operation will be aborted and the memory content is not guaranteed. The aborted operation

Table 49.

ISC_BLANK_CHECK sequence

Step

Tap activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_BLANK_CHECK

2DR-Scan

Shift in sector(s) to be blank checked. '1'

check; '0' don't check

Run-Test/Idle

Blank check starts, wait 40 ms

4DR-Scan

'0' = Sector selected and blank

'1' = Sector selected and not blank.

If sector is not selected for checking,

value is N/A

5IR-Scan

Load ISC_NOOP (to replace

ISC_BLANK_CHECK)

Run-Test/Idle

End

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