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STM86312 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. STM86312
Description  1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 6 page
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STM86312
6/16
Figure 3: Key Matrix And Key-input Data Storage Ram
The key matrix is of 6 x 4 configuration, as shown below
The data of each key are stored as illustrated below, and are read by the appropriate read command,
starting from the least significant bit
LED PORT
Data are written to the LED port by a write command, starting from the least significant bit of the port.
When a bit of this port is 0, the corresponding LED lights; when the bit is 1, the LED goes off. The data of
bits 5 through 8 are ignored.
On power application, all the LEDs remain dark.
KEY1
KEY4 KEY1
KEY4
Seg1/KS1
Seg2/KS2
Seg3/KS3
Seg4KS4
Seg5/KS5
Seg6/KS6
b0
b3 b4
b7
MSB
LSB
-
-
-
-
b3
b2
b1
b0
LED1
LED2
LED3
LED4
Don’t Care




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