Chapter 15 Liquid Crystal Display (LCD40F4BV3) Block Description
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
590
Freescale Semiconductor
15.4.4.5
1/4 Duty Multiplexed with 1/3 Bias Mode
Duty = 1/4:DUTY1 = 0, DUTY0 = 0
Bias = 1/3:BIAS = 0 or BIAS = 1
V
0
= VSSX, V
1
= VLCD * 1/3, V
2
= VLCD * 2/3, V
3
= VLCD
- A maximum of 160 segments are displayed.
Figure 15-15. 1/4 Duty and 1/3 Bias
15.4.5
LCD Clock Inputs & Reset Behavior
The LCD clock input can from main OSC (OSCCLK) or 32 kHz OSC (OSCCLK_32K), refer to Reference
Manual for detailed information. In case the clock source is from main OSC, after reset, the main OSC will
be disabled and must be enabled by setting the OSCE in CPMU as soon as possible in order to have clock
available for the LCD. If clock source is OSCCLK_32K, software must wait the OSC startup time before
enabling the LCD. If 32K OSC is enabled, it will be always on until a power on reset happens.
+VLCD
1/3
-VLCD
1/3
+VLCD
1/3
-VLCD
1/3
VLCD
1/3
VLCD
1/3
VLCD
1/3
VLCD
1/3
VLCD
1/3
0
VLCD
VSSX
BP0
+VLCD
-VLCD
BP0-FPx (ON)
1 Frame
VLCD
2/3
+VLCD
2/3
-VLCD
2/3
VLCD
VSSX
BP1
VLCD
2/3
VLCD
VSSX
BP2
VLCD
2/3
0
+VLCD
-VLCD
BP1-FPx (OFF)
+VLCD
2/3
-VLCD
2/3
VLCD
VSSX
FPx (1001)
VLCD
2/3
VLCD
VSSX
BP3
VLCD
2/3