SC667 datasheet(39/47 Pages) SEMTECH

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SC667

Lighting Effects Assignment Register (0Eh)

This register is used to assign the backlight LEDs to four

banks, bank #1, bank #2, bank #3, and bank #4. This regis-

ter is also used to assign the banks to two groups, group

#1 and group #2. Group #1 and group #2 are assigned

independently to a lighting effect and an effect rate, as

described in the next section, Effect Rate Options.

GRP1 and GRP0 [D4:D3]

These bits are used to assign banks into two groups of

independent lighting effects and effect rates. The group

assignments are shown in Table 14.

Table 14 — Lighting Effect Assignments

GRP1 GRP0

Bank(s) Assigned

Group #1

Bank(s) Assigned

to Group #2

#2, #3, and #4

#1 and #2

#3 and #4

#1, #2, and #3

#1,# 2, #3, and #4

no banks assigned

BANK2, BANK1, and BANK0 [D2:D0]

These bits provide bank assignments for all backlight

LEDs. Backlight bank assignments are shown in Table 15.

The table shows the backlight pins assigned to each of the

four banks, as assigned by the data bits BANK2, BANK1,

and BANK0.

Table 15 — Backlight Bank Assignments

Bank

BL1 - BL7

BL1

BL2 - BL7

BL1 - BL2

BL3 - BL7

BL1

BL2

BL3 - BL7

BL1 - BL3

BL4 - BL7

BL1

BL2

BL3

BL4 - BL7

BL1

BL2

BL3 - BL4

BL5 - BL7

BL1

BL2

BL3 - BL5

BL6 - BL7

Effect Rate Options (0Fh)

This register is used to set the effects rate for the fade and

breathe effects. Different effect rates may be applied to

group #1 and group #2.

ER2_2, ER2_1, and ER2_0 [D5:D3]

Banks assigned to group #2 will step through settings at

the rate shown in Table 16.

Table 16 — Effect Rates for Group #2

ER2_2

ER2_1

ER2_0

Breathe Rate

(ms�step)

Fade Rate

(ms�step)

snap to target

ER1_2, ER1_1, and ER1_0 [D2:D0]

Banks assigned to group #1 will step through settings at

the rate shown in table 17.

Table 17 — Effect Rates for Group #1

ER1_2

ER1_1

ER1_0

Breathe Rate

(ms�step)

Fade Rate

(ms�step)

snap to target

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