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ST92F120/F124/150/F250 TESTFLASH

■

check the value of the SOUT0 pin (SOUT pin of SCI0 macrocell): if it is low, the “Code

Update routine” is called.

■

check the Power-On Vector of the User application: if its value is FFFFh HALT instruction is

executed, otherwise the execution jumps into the location it points to.

The User Application should check the 2 Output variables of the Power-On routine:

The “Code Update routine” writes an output code in the R1 register to show if no update has

been requested or the update has been requested and the SCI communications have been

performed correctly (Good Code: 23h), or if the update has been requested, but the SCI com-

munications has not been performed correctly in the timeout of 10ms (for a Fosc frequency of

4MHz) (Bad Code: 3Fh).

duration of the Power-On routine as a function of the external clock period Tck is shown in the

following table.

3.2 NON MASKABLE INTERRUPT ROUTINE

Inputs: None.

Outputs: None.

Variables: None.

Goal: react to a Non Maskable Interrupt when the Vector Table is remapped in TestFlash.

This routine should never be called, since the Vector Table is normally mapped in the Flash

address space.

This routine does not perform any operation, simply returns from interrupt.

Table 2. Power-On routine typical duration

Condition

Typical Power-on routine duration

with Fosc=4MHz

Normal operation (no E3 TM operation)

33 ms

SOUT0 pulled low, no code update

42 ms

Aborted E3 TM write operation (worst case)

165 ms (1)

(1) This duration depends also on E3 erasing

and programming times