Sharp LH79524 - CLCDC Register Descriptions; Table 4-14. TIMING0 Register; Table 4-15. TIMING0 Fields

Color Liquid Crystal Display Controller LH79524/LH79525 User’s Guide
4-20 Version 1.0
4.5.3 CLCDC Register Descriptions
4.5.3.1 Horizontal Timing Panel Control Register (TIMING0)
The TIMING0 Register controls:
• Horizontal Synchronization Pulse Width (HSW)
• Horizontal Front Porch (HFP) period
• Horizontal Back Porch (HBP) period
• Pixels-Per-Line (PPL)
Table 4-14. TIMING0 Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD HBP HFP
RESET 0000000000000000
RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD HSW PPL ///
RESET 0000000000000000
RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RO RO
ADDR 0xFFFF4000 + 0x00
Table 4-15. TIMING0 Fields
BIT NAME DESCRIPTION
31:24 HBP
Horizontal Back Porch HBP specifies the number of LCDDCLK periods
between the end of the LCDLP signal and the beginning of valid data. HBP can
be programmed for a delay of 1 to 256 pixel clock cycles.
HBP = (LCDDCLK periods) – 1
23:16 HFP
Horizontal Front Porch HFP specifies the number of LCDDCLK periods
between the end of valid data and the beginning of the LCDLP signal. HFP can
be programmed for a delay of 1 to 256 pixel clock cycles.
HFP = (LCDDCLK periods) – 1
15:8 HSW
Horizontal Synchronization Pulse Width HSW specifies the width of the
LCDLP signal, in LCDDCLK periods. In STN modes, this signal is referred to
as the ‘line clock’. In TFT modes, this signal is referred to as the ‘horizontal
synchronization pulse’.
HSW = (LCDDCLK periods) – 1
7:2 PPL
Pixels-Per-Line PPL specifies the number of pixels in each line of the
LCD panel. The PPL value sets the number of pixel clocks that occur before
the value in the HFP bit field is applied (that is, before the LCDLP signal is
asserted). The PPL bit field is a 6-bit value that represents a number
corresponding to the actual pixels-per-line, which can range from 16 to 1,024. At
reset this field is 0, which corresponds to 16 actual pixels-per-line.
PPL = (Actual pixels-per-line/16) – 1
Actual pixels-per-line = 16 × (PPL + 1)
1:0 /// Reserved Reading returns 0. Write the reset value.