LCD Controller Registers
11-43
LCD Controller
The waveforms in Figure 11–18 show PHSVS_ON_OFF = 1,
PHSVS_RISE_FALL = 0, and IPC = 1.
Figure 11–18.
Signal Timing When PHSVS_ON_OFF = 1
Pixel 0
IPC=1
HPC-1
VPC-1
LCD.AC
LCD.VS
LCD.HS
LCD.P[15:0]
LCD.PCLK
ac-Bias Line Transactions Per Interrupt (ACBI)
The 4-bit ac-bias line transitions per interrupt (ACBI) field is used to specify the
number of LCD.AC line transitions to count before setting the ac-bias count
status (ABC) bit in the LCD controller status register, which signals an interrupt
request. After the LCD controller is enabled, the value in ACBI is loaded to a
4-bit down counter, and the counter decrements each time the ac-bias line
state is inverted. When the counter reaches zero, it stops and the ac-bias count
(ABC) bit is set in the status register. When ABC is set, the 4-bit down counter
is reloaded with the value in ACBI and is disabled until ABC is cleared. When
ABC is cleared by the CPU, the down counter is enabled and it decrements
each time the ac-bias line is flipped. The number of ac-bias line transitions
between each interrupt request ranges from 0 to 15. Programming ACBI =
0h0000 disables the ac-bias line transitions per the interrupt function.
