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AS1106 Datasheet PDF : 20 Pages
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AS1106, AS1107
Data Sheet
austriamicrosystems
Digit- and Control-Registers
Shutdown Register (0xXC)
The Shutdown Register controls AS1106/AS1107 shutdown mode (see Shutdown Mode on page 8).
Table 7. Shutdown Register Format (Address (HEX) = 0xXC))
Mode
Shutdown Mode,
Reset Feature Register to Default Settings
Shutdown Mode, Feature Register Unchanged
Normal Operation,
Reset Feature Register to Default Settings
Normal Operation, Feature Register Unchanged
HEX Code
0x00
0x80
0x01
0x81
Register Data
D7 D6 D5 D4 D3 D2 D1 D0
0XXXXXX0
1XXXXXX0
0XXXXXX1
1XXXXXX1
Decode Enable Register (0xX9)
The Decode Enable Register sets the decode mode. BCD/HEX decoding (either BCD code – characters 0:9, E, H, L,
P, and -, or HEX code – characters 0:9 and A:F) is selected by bit D2 (page 12) of the Feature Register. The Decode
Enable Register is used to select the decode mode or no-decode for each digit. Each bit in the Decode Enable Regis-
ter corresponds to its respective display digit (i.e., bit D0 corresponds to digit 0, bit D1 corresponds to digit 1 and so
on). Table 9 lists some examples of the possible settings for the Decode Enable Register bits.
Note: A logic high enables decoding and a logic low bypasses the decoder altogether.
When decode mode is used, the decoder looks only at the lower-nibble (bits D3:D0) of the data in the Digit-Registers,
disregarding bits D6:D4. Bit D7 sets the decimal point (SEG DP) independent of the decoder and is positive logic (bit
D7 = 1 turns the decimal point on). Table 9 lists the code-B font; Table 10 lists the HEX font.
When no-decode mode is selected, data bits D7:D0 of the Digit-Registers correspond to the segment lines of the
AS1106/AS1107. Table 11 shows the 1:1 pairing of each data bit to the appropriate segment line.
Table 8. Decode Enable Register Format (Address (HEX) = 0xX9))
Decode Mode
Register Data
HEX Code
D7 D6 D5 D4 D3 D2 D1 D0
No decode for digits 7:0
0x00
0000000 0
Code-B/HEX decode for digit 0. No decode for digits 7:1
0x01
00000001
Code-B/HEX decode for digits 3:0. No decode for digits 7:4 0x0F
00001111
Code-B/HEX decode for digits 7:0
0xFF
11111111
Figure 12. Standard 7-Segment LED Intensity Control and Inter-Digit Blanking
A
F
B
G
E
C
D DP
Table 9. Code-B Font
7-Segment
Character
0
1
2
3
4
Register Data
On Segments = 1
D7 † D6:D4 D3 D2 D1 D0 DP † A B C D E F G
X
0000
1111110
X
0001
0110000
X
0010
1101101
X
0011
1111001
X
0100
0110011
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