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SC668
Register Map (continued)
Bank #4 Backlight Register (05h)
This register is used to set the current for the backlight
LEDs in bank #4 and to enable the lighting effect feature
for bank #4. These backlights can be turned off using the
backlight enable bits of registers 00h and 01h. Writing the
0mA value into this register will also turn off the back-
IB4_4 through IB4_0 [Bits D4:D0]
These bits are used to set the current for the backlight
LEDs in bank #4. All bank #4 enabled current sinks will sink
the same current as shown in Table 5.
Table 5 — Bank #4 Backlight Current
lights, but only if the blink and breathe effects are
disabled.
IB4_4
IB4_3 IB4_2
IB4_1
IB4_0
Backlight
Current (mA)
B4FEN Bit D5
This bit works in conjunction with the B4BEN bit of register
09h to set a lighting effect for bank #4. Figure 23 shows
the lighting effects which are enabled by the combination
of B4FEN and B4BEN. When fade is enabled, fading will
occur in bank #4 each time the bank #4 current is changed,
enabled, or disabled. Blink and breathe functions run in a
continuous loop when they are enabled.
B4BEN = 0
B4FEN = 1
Fade
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0.05
0.1
0.2
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
B4BEN = 1
B4FEN = 0
Blink
Bank #4
No Light Effect
B4BEN = 0
B4FEN = 0
0
0
1
1
1
1
1
1
0
1
6
7
1
1
0
0
0
0
0
0
0
1
8
9
Breathe
B4BEN = 1
B4FEN = 1
Figure 23 — Bank #4 Lighting Effect
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
10
11
12
13
14
15
16
17
18
19
20
21
23
25
31
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