STFPC320 STMicroelectronics, STFPC320 Datasheet - Page 30

• Manufacturer Part Number: STFPC320
• Description: Front Panel Controller/driver With Standby Power Management And Real-time Clock
• Manufacturer: STMicroelectronics

Commands
7
7.1
Description:
Note:
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Commands
A command sets the display mode and status of the VFD driver.
The first 1 byte input to the STFPC320 through the SDA pin after the slave address is
regarded as a command. If slave address is not transmitted before the commands/data are
transmitted, the commands/data being transmitted are invalid (however, the commands/data
already transmitted remain valid).
Configuration mode setting command
This command initializes the STFPC320 and performs any one of the following functions:
1.
2.
3.
4.
When displaying the RTC during normal mode, if the µP is writing data to STFPC320 using
I2C bus, the RTC display on VFD momentarily turns OFF.
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, 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 guard timer. The guard timer is configurable from 1 to 15s or turned off
completely.
Sets the guard timer action to perform when the guard timer counts. Two actions are
allowed: no action, set STBY to high level.
Bits b7-b6 = 00 is decoded as a configuration mode setting command. The
subsequent bits are decoded as follows:
b5: Reserved
b4 : Normal display setting
b3: RTC display setting (during normal or STBY modes)
b2: enables all RC keys as hot-keys
b1: Reserved
b0: enables the guard timer to issue STBY
MSB
0
0
b5
b4
b3
b2
b1
LSB
b0
STFPC320