ST10F276Z5 datasheet(69/239 Pages) STMICROELECTRONICS

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ST10F276Z5

Bootstrap loader

69/239

5.6.10

EMUCON register

5.6.11

Internal decoding of test modes

The test mode decoding logic is located inside the ST10F276Z5 Bus Controller.

The decoding is as follows:

●

Alternate Boot mode decoding: (P0L.5 & P0L.4)

●

Standard Bootstrap decoding: (P0L.5 & P0L.4)

●

Normal operation: (P0L.5 & P0L.4)

The other configurations select ST internal test modes.

5.6.12

Example

In the following example, Alternate Boot mode works as follows: on rising edge of RSTIN

pin, the reset configuration is latched:

●

If Bootstrap Loader mode is not enabled (P0L[5..4] = ‘11’), the device hardware

proceeds with a standard hardware reset procedure.

●

If standard Bootstrap Loader is enabled (P0L[5..4] = ‘10’), the standard ST10 Bootstrap

Loader is enabled and a variable is cleared to indicate that ABM is not enabled.

●

If Alternate Boot mode is selected (P0L[5..4] = ‘01’), then, depending on signatures

integrity checks, a predefined reset sequence is activated.

EMUCON (FE0Ah / 05h)

SFR

Reset value: - xxh:

987

65432

ABM

-R

Table 37.

ABM bit description

Bit

Function

ABM

ABM Flag (or TMOD3)

‘0’: Alternate Boot mode is not selected by reset configuration on P0L[5..4]

‘1’: Alternate Boot mode is selected by reset configuration on P0L[5..4]: This bit is

set if P0L[5..4] = ‘01’ during hardware reset.

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