Epson LQ 1050 Technical Manual - Page 72

Table 2-3. Pin Function of CPU cent'd, Pin No., Signal, NOTE: Direction on the signal flow

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Table 2-3. Pin Function of CPU (cent'd) Pin No. 26 27 28 29 30 31 32 33 34 35 36 37 I 39 40 41 42 43 44 45 46 47 I 54 55 I 62 63 64 Signal Name INT1 MODE1 RESET MODEO x2 xl Vss AVSS ANO AN 1 AN2 AN3 I AN5 AN6 AN7 VAref AVCC RD WR ALE PFO I PF7 PDO I PD7 VDD Vcc Direction - - IN - - - - IN IN IN IN Function Not used External mode setting terminal External reset signal External mode setting terminal Oscillator terminal. FX-850/1050 : 14.74 MHz Ground Analog port ground Vp (+ 24VDC) monitor port Vu (+ 36VDC) monitor port Printhead short-circuit monitor port DIP switch 2-1 to 2-3 - IN - OUT OUT OUT OUT Not used Analog reference voltage input : 4.7V Analog port power source Read strobe signal output Write strobe signal output Address Latch Enable signal output (Low address : AO -A8) High address data (A8 -Al 5) IN/OUT 8 bit address/data bus - Internal memory power source - Main power sourse NOTE: "Direction" on the signal flow is as viewed from the CPU. 2-28

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Table 2-3. Pin Function of CPU (cent’d)
Pin No.
Signal
Name
Direction
Function
26
INT1
—
Not used
27
MODE1
—
External mode setting terminal
28
RESET
IN
External reset signal
29
MODEO
—
External mode setting terminal
30
x2
Oscillator terminal. FX-850/1050 : 14.74 MHz
—
31
xl
32
Vss
—
Ground
33
AV
SS
—
Analog port ground
34
ANO
IN
Vp
(+
24VDC) monitor port
35
AN 1
IN
Vu
(+
36VDC)
monitor port
36
AN2
IN
Printhead short-circuit monitor port
37
AN3
IN
DIP switch 2-1 to 2-3
I
I
39
AN5
40
AN6
—
Not used
41
AN7
42
VAref
IN
Analog reference voltage input : 4.7V
43
AV
CC
—
Analog port power source
44
RD
OUT
Read strobe signal output
45
WR
OUT
Write strobe signal output
46
ALE
OUT
Address Latch Enable signal output
(Low address : AO -A8)
47
PFO
OUT
High address data (A8 -Al 5)
I
I
54
PF7
55
PDO
IN/OUT
8 bit address/data bus
I
I
62
PD7
63
VDD
—
Internal memory power source
64
Vcc
—
Main power sourse
NOTE: “Direction” on the signal flow
is as viewed from the CPU.
2-28