ELCOM Euro-50, Service Manual

Page: 39 / 82

Euro-50 Service manual
39
Elcom s. r. o.
resistors according to their function (see the State during reset column). This ensures that for inputs only the voltages
concurring with H or L levels occurs
Table 5.3. Port 0
Output Signal Type Function
Active level - specifi-
cation
State during reset
Type - quiet
state
P00 XT1 input State of jumper XT1 L - jumper connected
according to the
state of jumper
L or H
-
P01 XT2 input State of jumper XT1 L - jumper connected
according to the
state of jumper
L or H
-
P02 ON-OFF output
Controlling supplies for
3.3V
(VDDQ) and 1.8V (VDD)
H - VDDQ, VDD swit-
ched on
L H
P03 EXT5VON output
Managing 5V source for
external equipment
H - EXT5V switched on L L
P04 CS0n EMI CS for external RAM L H output - H
P05 DISPRST1 output
Reset signal for display
controller 1
H – reset for PCF2119X H L
P06 DISPRST2
output OD
for 7-segment
display (output
for alphanu-
meric display) Switching on supply for
7- -segmented customer
display (Reset for PCF2119X
if customer display is
alphanumeric)
L - switched on power
for 7-segment display
(H – reset for PCF2119X)
H L
P07 DP-PULL-UP output OD
Controlling pull-up 1K5 for
detection of USB L – USB D+ pull-up
connected
H H
Table 5.4. Port 1
Output Signal Type Function
Active level
- specification
State during reset
Type
- quiet state
P10
SDCLK/
FCLK SSP1, Master,
SPI mode 0, SCK SCLK (data FLASH, SD
card)
- L output - L
P11 SDDI/FDI
SSP1, Master,
SPI mode 0, MOSI MOSI (data FLASH,
SD card)
- H output - H
P12 SDDO/FDO
SSP1, Master,
SPI mode 0, MISO MISO (data FLASH,
SD card)
- H input - X
P13 SDCSn output CS for SD card L H H
P14 PLATEN input
External platen position
sensor
L - roller withdrawn
H - roller in position
for printing. State of
the sensor can only be
determined if voltage
VDDQSW is switched
on
L -
P15 FCSn output CS for data FLASH L H H
P16 VDDON output
Controlling voltage for
printer logic and sensors
(PS1, PS2, Platen), waking
the exciter of the motor
from the power save state H - switched on
VDDQSW, waking the
exciter of the motor
from the power save
state
L L
P17 VHON output
Controlling voltage for
thermal head and printer
motor
H - switched on VH L L
Table 5.5. Port 2
Output Signal Type Function
Active level
- specification
State during reset
Type
- quiet state
P20 DISPCLK I2C0, Master, SCL
SCL, customer and cashier
display
- H output OD - H