Figure 2-21. Serial Data Transfer Procedure - Epson STYLUS PRO XL 4004677 Service Manual

Operating Principles
The following figure shows the contents of the four-bit serial data and how this data transacts
with the SLA7041MS driver. The step time of the reference voltage is determined by the interval
time of the STROBE pulse.
Vref
To Mot or
(Phase Signal)
STRB
4-bit Serial Data
C L K
C L K
STRB

Figure 2-21. Serial Data Transfer Procedure

2-18
Vref
+5 V
Vref Voltage Selection
Circuit
1-bit 2-bit
a
Phase
1-bit 2-bit
a
Phase
Reading of serial data from the
Phase signal in order
At this time, the reference voltage selection
circuit checks phase signal outputs
SL A7 04 1 M S
3-bit 4-bit
b c
Latch
3-bit 4-bit
b c
4-bit Shift Register
Stylus Pro XL
REV.-A