User manual

9 Recovery of the Example Programmes

If you want to restore the controller's original condition after some time, this can be done by

entering two bytes FF. In fact, this corresponds to the condition of the unwritten EEPROM. The

firmware of the TPS controller contains a start function that initially reviews the first two

addresses to recognise an empty memory. If two FF-bytes are read here, the controller assumes

that no programme has been entered yet. In this case, the EEPROM is automatically filled with

the example software. This function actually serves to apply the controller with the example

programme in the EEPROM at the first start. However, it can be used at any time to restore

factory settings.

Address

Command

Data

Comment

Listing 8: Return to the factory condition

Start programming mode by resetting with the S2 button pushed. Enter the value F (decimal 15)

four times then, where all LEDs A1 to A4 are on. Complete the last input with S2 as well.

Then push reset. The controller needs just a moment longer than usual to reprogramme all

bytes from the example programmes. This restores the original condition. Test, e.g., the

alternating flash from page 8 without the jumper at the inputs.

10 TPS Basic Commands

The key-programmable control knows a total of 14 commands (1–14). Many of these commands

have a parameter in the form of a 4-bit number 0000 to 1111 (0–F), i.e. with a number range to

15 (decimal). Other commands know subfunctions that are indicated as a parameter. A

command code may therefore contain up to 16 subcommands. For example, command 7 means

"Compute A = ...". The parameter indicates which computation function is to be performed.

Below, the commands and data are written together in hexadecimal code as one byte.

Command 1 together with parameter 4 thus becomes the command 14h. The hex sign is left out

because all commands and addresses are generally written in hexadecimal code.

The first three commands are:

10–1F: Direct port output at A1–A4, 0–15, binary 0000 to 1111

20–2F: Waiting time 0–15

(1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, 2,000, 5,000, 10,000, 20,000, 30,000, 60,000 ms)

30–3F: Jump back 0–15

Command 1 is used for port output of a constant number. This permits outputting any bit pattern

and e.g switching on several LEDs at the same time.