STFPC311 datasheet(22/39 Pages) STMICROELECTRONICS

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7 Programmable hotkeys

STFPC311

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Programmable hotkeys

7.1

IR Remote control

Eight (8) commands are user programmable for hot key functions.

The address of the appliance (8-bit) is stored first into the internal RAM. Then, the command for

the hot keys are programmed into the internal RAM. Each hot key memory address could

accommodate one byte (8-bits). Usually one byte is reserved for one command. The RC data

is only cleared when the READY is pulled low (system goes into STANDBY state).

7.2

Front panel keys

Eight out of 24 keys are user programmable for hot key functions. Only keys from KS1 to KS4

can be programmed.

Figure 18. Programmable hot keys (only KS1 to KS4, Box FPK1)

8 hot keys are to be placed in each address location as indicated by the hotkey setting

command.

Figure 19. HOTKEY setting command address locations (8 hot keys)

For example, to store (Seg2/Key2) at the first location of the hot key RAM, the following

commands are sent:

●

10110000 (command+address), and

●

00010000 (hot key mask).

To store (Seg2/Key1), (Seg2/Key2), and (Seg4/Key1), the following commands are sent:

●

10110000 (command+address), and

●

00110010 (hot key mask).

The same commands apply to FPK2 and FPK3 programming.

Note:

Note: Reading the hot key values immediately upon STBY de-assertion is recommended. If

they are not read within the watchdog preset timer value, the hot key data is cleared.

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