Sharp ER-A450T Service Manual page 17

Pin SIGNAL IN/
SYMBOL
No. NAME OUT
32 KR6 KR6
33 KR7 KR7
34 AVRF GND
35 AVDD VDD
36 /RESET /RES0
37 XT2
38 XT1
39 IC GND
40 X2
41 X1
42 VSS1 GND
43 LDRQ LDRQ
44 ERC ERC
45 SHEN /SHEN OUT SHIFT ENABLE
46 /RES1 /RESETS OUT SYSTEM TO RESET
47 ST6 ST6 OUT KEY STROBE 6
48 ST7 ST7 OUT KEY STROBE 7
49 ST8 ST8 OUT KEY STROBE 8
50 ST9 NU OUT KEY STROBE 9
51 /POFF /POFF
52 BUZ BUZ OUT BUZZER
53 T0 G1 OUT DISPLAY DIGIT 1
54 T1 G2 OUT DISPLAY DIGIT 2
55 T2 G3 OUT DISPLAY DIGIT 3
56 T3 G4 OUT DISPLAY DIGIT 4
57 T4 G5 OUT DISPLAY DIGIT 5
58 T5 G6 OUT DISPLAY DIGIT 6
59 T6 G7 OUT DISPLAY DIGIT 7
60 T7 G8 OUT DISPLAY DIGIT 8
61 T8 G9 OUT DISPLAY DIGIT 9
62 T9 G10 OUT DISPLAY DIGIT 10
63 T10 NU OUT DISPLAY DIGIT 11
64 ID NU OUT DISPLAY SEGMENT
FUNCTION
IN KEY RETURN 6
IN KEY RETURN 7
IN
32.768 KHz
4.19 MHz
IN LORD REQUEST
IN EVENT READ CANCEL
IN POWER OFF
2-4. TPRC1 (F258024PC)
1) General
TPRC1 is the LSI circuit of the peripheral circuits of the microcom-
puter required for thermal printer control.
Auto cutter Pulse motor
POF,RES
CPU
A0~23
(H8/500)
D0~7
RD
WR
WAIT
INT
PHAI
CG ROM
The CPU is designed for use with H8/500. The bus I/F, however, is
not restricted to the design concept.
The printer is designed mainly for use with PR-58. However, the
thermalhead composition (the dot number and the block number) is
rather flexible.
1. Auto cutter (Option)
2. Pulse motor
3. Thermalhead
4. Switch
4 – 9
Thermal
SO
head
CLOCK
TPRC1
SI
LATCH
ST1~4
HCD
PHUP,PSP,
Switch
PST,POP
sensor
PB RAM
(SRAM)
Fig. 2-6