Programming sequence

PM0064

10/13

Doc ID 16274 Rev 3

3.4

Option verify (directly after option programming)

The STM8T141 has been successfully programmed if both the following reads return the

correct option values.

1.

Option read (State_20) reads the options that were programmed. See Table 7: Option

verify (State_20).

2.

Option read (State_22) reads the options at a different level - as a double check. See

Table 8: Option verify (State_22).

Note:

The ‘Low’ level of Steps 4 and 5 during programming are not absolutely mandatory. They

could be ‘High’ if it is easier for the electronic command; provided they have the correct level

for the next state transition.

Table 7.

Option verify (State_20)

Step

Action

Explanation

1.

CX - 3 double clock

Clock IC until it is in State_19 (with CS still low).

2.

CS = HIGH

CS = 1 required for transition from State_19 to State_20.

3.

CX - 1 double clock

Clock IC into State_20.

4.

CX - 1 double clock

The IC place option_0 value on OUT.

5.

Read option on OUT

Option value is now available on OUT pin.

6.

Repeat Steps 4 and 5 for

all 16 options.

Each option's value is clocked out - one after another.

Table 8.

Option verify (State_22)

Step

Action

Explanation

1.

CS = LOW

CS = 0 required for transition from State_20 to State_22.

2.

CX - 1 double clock

Clock IC into State_22.

3.

CS = HIGH

CS = 1 required to remain in State_22 while reading options.

4.

CX - 1 double clock

The IC place option_0 value on OUT.

5.

Read option on OUT

Option value is now available on OUT pin.

6.

Repeat Steps 4 and 5 for

all options.

Each option's value is clocked out - one after another.

7.

IC power OFF

VDD = 0 V