Seiko LTP1245R-C384-E, Техническое описание, Страница: 49 / 74

5-1
5
DRIVE METHOD
5.1 THERMAL HEAD DRIVE TIMING
Input of print data
Input of DAT and CLK transfer the print data to the shift register in serial input. “High” means
printing and “Low” means no-printing in DAT. DAT data is read in at the rising edge of the CLK
inputs. The transferred line of data is stored in the latch register by turning LATCH to “Low”.
Input of the head activation pulse
"High" of DST drives the heat elements of the thermal head. Then let DST go to "Low" after driving
for the period calculated using the formula shown in
"3.6 CONTROLLING THE HEAD
ACTIVATION (DST) PULSE WIDTH" .
Figure 5-1 shows the example of timing chart of the thermal head driving.
1:
The print data for next dot line can be transfered immediately after storing the print data into the latch register.
Figure 5-1 Example of Timing Chart of the Thermal Head Driving
CHAPTER
CLK
DAT
DST
Latching data
Data transfer
1
LATCH
Data transfer