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Hardware Functional Specification S1D13504
Issue Date: 01/01/30 X19A-A-002-18
bits 6-0 Horizontal Display Width Bits [6:0]
These bits specify the LCD panel and/or the CRT horizontal display width as follows.
Contents of this Register = (Horizontal Display Width ÷ 8) - 1
For passive LCD panels the Horizontal Display Width must be divisible by 16, and for TFT LCD
panels/CRTs the Horizontal Display Width must be divisible by 8. The maximum horizontal dis-
play width is 1024 pixels.
Note
This register must be programmed such that REG[04h] 3 (32 pixels)
bits 4-0 Horizontal Non-Display Period Bits [4:0]
These bits specify the horizontal non-display period width in 8-pixel resolution as follows.
Contents of this Register = (Horizontal Non-Display Period ÷ 8) - 1
The minimum value which should be programmed into this register is 3 (32 pixels). The maximum
value which can be programmed into this register is 1F, which gives a horizont al non-display period
width of 256 pixels.
Note
This register must be programmed such that
REG[05h] 3 and (REG[05h] + 1) (REG[06h] + 1) + (REG[07h] bits [3:0] + 1)
bits 4-0 HRTC/FPLINE Start Position Bits [4:0]
For CRTs and TFTs, these bits specify the delay from the start of the horizontal non-display period
to the leading edge of the HRTC pulse and FPLINE pulse respectively.
Contents of this Register = (HRTC/FPLINE Start Position ÷ 8) - 1
The maximum HRTC start delay is 256 pixels.
Note
This register must be programmed such that
(REG[05h] + 1) (REG[06h] + 1) + (REG[07h] bits [3:0] + 1)
Horizontal Display Width Register
REG[04h] RW
n/a Horizontal
Display Width
Bit 6
Horizontal
Display Width
Bit 5
Horizontal
Display Width
Bit 4
Horizontal
Display Width
Bit 3
Horizontal
Display Width
Bit 2
Horizontal
Display Width
Bit 1
Horizontal
Display Width
Bit 0
Horizontal Non-Display Period Register
REG[05h] RW
n/a n/a n/a Horizontal
Non-Display
Period Bit 4
Horizontal
Non-Display
Period Bit 3
Horizontal
Non-Display
Period Bit 2
Horizontal
Non-Display
Period Bit 1
Horizontal
Non-Display
Period Bit 0
HRTC/FPLINE Start Position Register
REG[06h] RW
n/a n/a n/a HRTC/
FPLINE Start
Position Bit 4
HRTC/
FPLINE Start
Position Bit 3
HRTC/
FPLINE Start
Position Bit 2
HRTC/
FPLINE Start
Position Bit 1
HRTC/
FPLINE Start
Position Bit 0