STFPC311 datasheet(18/39 Pages) STMICROELECTRONICS

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6 Commands

STFPC311

18/39

Commands

A command sets the display mode and status of the VFD driver. The first 1-byte input to the

STFPC311 through the DIN pin after the STB pin goes low is regarded as a command. If STB is

set to high while commands/data are transmitted, the serial communication is initialized and the

commands/data being transmitted are invalid (however, the commands/data already

transmitted remain valid).

6.1

Configuration mode setting command

This command initializes the STFPC311 and performs any one of the following functions see

Figure 14.

Selects the number of segments and number of grids (1/8 to 1/16 duty, 12 segments

to 20 segments). When this command is executed, the display is turned off. To

resume display, the Display ON command must be executed. If the same mode is

selected, nothing is performed.

Selects the remote control protocol to use.

Sets the watchdog timer. The watchdog timer is configurable from 1s to 15s or turned

off completely.

Sets the watchdog action to perform when the watchdog timer counts. Two actions

are allowed: no action, and set STBY to (logic) high level.

Figure 14. STFPC311 Configuration mode setting command order

Table 3.

STFPC311 Configuration mode bit 3 through bit 0 settings

Note:

Based on Bit 5 through Bit 4 settings.

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