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Register Map (continued)
Definition of Registers and Bits
Backlight Enable Register (00h)
The bits of register 00h are used to enable individual back-
light current sinks BL1 through BL6.
BL6EN through BL1EN [D5:D0]
These bits are used to enable current sinks which control
backlight current. When enabled, the current sinks will
regulate the backlight current set by the corresponding
backlight current register.
Bank Enable Register (01h)
The bits of register 01h are multi-function bits. The func-
tion of bits D3 through D0 depend upon the state of bits
D5 and D4. Bits D3 through D0 may be used to turn indi-
vidual banks on and off. An alternate function of bits D1
and D0 is to enable and disable backlights BL7 and BL8.
Figure 19 shows how the function of bits D3 through D0
change according to the state of the DIS bit D5 and the EN
BANK4EN through BANK1EN [Bits D3:D0]
The following bits — BANK4EN, BANK3EN, BANK2EN, and
BANK1EN are used to enable or disable individual back-
light banks dependent upon the state of the DIS and EN
bits, D5 and D4. These bits provide no function when both
DIS and EN are equal to one.
BL8EN and BL7EN [Alternate Function for Bits D1:D0]
These bits are used to enable current sinks which control
backlight current for backlights BL7 and BL8. When
enabled, the current sinks will regulate the backlight
current set by the corresponding backlight current
register.
DIS = 0
EN = 1
D3=1 enables bank #4
D2=1 enables bank #3
D1=1 enables bank #2
D0=1 enables bank #1
bit D4.
DIS [Bit D5]
When writing to register 01h, if DIS bit D5 = 1 and EN bit
D4 = 0, then bits D3 through D0 can each disable one of
DIS = 1
EN = 0
D3=1 disables bank #4
D2=1 disables bank #3
D1=1 disables bank #2
D0=1 disables bank # 1
Register 01h
Bits [D3:D0] (1)
(1) Bit functions are
active high only, a
zero has no function
D3=1 does nothing
D2=1 does nothing
D1=1 enables BL8
D0=1 enables BL7
DIS = 0
EN = 0
four banks. When disabling a bank, all associated BLxEN
bits are automatically overwritten with a zero.
EN [Bit D4]
When writing to register 01h, if EN bit D4 = 1 and DIS bit
D5 = 0, then bits D3 through D0 can each enable one of
four banks. When enabling a bank, all associated BLxEN
D3=1 does nothing
D2=1 does nothing
D1=1 does nothing
D0=1 does nothing
DIS = 1
EN = 1
Figure 19 — Multi-function Bits of Register (01h)
bits are automatically overwritten with a one.
27
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