Epson Research and Development Page 69
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Hardware Functional Specification S1D13504
Issue Date: 01/01/30 X19A-A-002-18
7.4.5 Single Color 4-Bit Panel Timing

Figure 7-23: Single Color 4-Bit Panel Timing

VDP = Vertical Display Period = (REG[09h] bits [1:0], REG[08h] bits [7:0]) + 1
VNDP = Vertical Non-Display Period = (REG[0Ah] bits [5:0]) + 1
HDP = Horizontal Display Period = ((REG[04h] bits [6:0]) + 1)*8Ts
HNDP = Horizontal Non-Display Period = ((REG[05h] bits [4:0]) + 1)*8Ts
VDP
FPLINE
UD[3:0] LINE1 LINE2 LINE3 LINE4 LINE479 LINE480
FPFRAME
LINE1 LINE2
FPLINE
MOD
UD2
UD1
UD0
UD3
MOD
VNDP
1-R1
1-G1
1-B1
1-R2
1-G2
1-B2
1-R3
1-G3
1-B3
1-R4
1-G4
1-B4
1-B319
1-R320
1-G320
1-B320
HDP HNDP
* Diagram drawn with 2 FPLINE vertical blank period
Example timing for a 640x480 panel
FPSHIFT