Page 84 Epson Research and Development
Vancouver Design Center
S1D13705 Hardware Functional Specification
X27A-A-001-10 Issue Date: 02/02/01
Figure 13-1: Panel On/Off Sequence
After chip reset, LCDPWR is inactive and the rest of the panel interface output signal s are
held “low”. Software initializes the chip (i.e. programs all registers except the Look-Up
Table registers) and then programs REG[03h] bits [1:0] to 11b. This starts the power-up
sequence as shown. The power-up/power-down sequence delay is 127 frames. The Look-
Up Table registers may be programmed any time after REG[03h] bits[1:0] = 11b.
The power-up/power-down sequence also occurs when exiting/entering Software Power
Save Mode.
13.5 Turning Off BCLK Between Accesses
BCLK may be turned off (held low) between accesses if the following rules are observed:
1. BCLK must be turned off/on in a glitch free manner
2. BCLK must continue for a period equal to [8TBCLK + 12TMCLK] after the end of the
access (RDY# asserted or WAIT# deasserted).
3. BCLK must be present for at least one TBCLK before the start of an access.
RESET#
LCDPWR
Panel Interface
Output Signals
(except LCDPWR)
0 frame 127 frames 0 frame
Power Sa ve Mode
power-down power-uppower-up
Software Power Save 00 11 00 11
Hardware Power Save
REG[03h] bits [1:0]
or