Appendix D-54 Product Overview Rev. A
Confidential
Reset Circuit
Stable operation of the CPU and GA requires, a certain reset period immediately after power up.
All operations return to their initial status after the reset operation. The reset IC (U1) on this
printer monitors the logic power source (VCC, Standard output: +5V), and sets the reset signal
to LOW when the VCC is 4.2V or lower. The reset signal is restored from LOW to HIGH 50 ms
after the VCC exceeds 4.2V. The CPU and GA operate normally after reset.
The main specifications of the reset IC are shown below:
Reset also can be performed by sending the reset signal from the host interface.
GACS 93 GA CS CS_GA IN Not
selected
GA
selected
PH5/STB1 94 Thermal head strobe-1 TH_STB1 OUT Not
selected
Block 1
selected
PH4/STB2 95 Thermal head strobe-2 TH_STB2 OUT Not
selected
Block 2
selected
PH3/DI1 96 Thermal head block-1 DATA TH_D1 OUT Printed Not
printed
PH2/DI2 97 Thermal head block-2 DATA TH_D2 OUT Printed Not
printed
VSS7 98 Fixed power source GND
PH1/SCLK 99 Thermal head SCLK H_SCLK OUT Data
input at
leading
edge
PH0/LAT 100 Thermal head DATA latch TH_LAT OUT Retained Latched
TableD-9 Reset IC specifications
Item Min. Typ. Max.
Detection Voltage (V) 4.0 4.2 4.5
Hysteresis Voltage (mV) 30 50 100
Delay Time (ms) 30 50 75
M/R Terminal "H" Voltage (V) 2.0 - -
TableD-8 GA terminals and functions
Terminal
Name
Pin
No. Description
Circuit Signal
Name Spec.
Meaning
of H
Meaning
of L
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