Sharp ER-A450T, Service Manual

Page: 17 / 76

Pin
No.
SYMBOL
SIGNAL
NAME
IN/
OUT
FUNCTION
32 KR6 KR6 IN KEY RETURN 6
33 KR7 KR7 IN KEY RETURN 7
34 AVRF GND
35 AVDD VDD
36 /RESET /RES0 IN
37 XT2
32.768 KHz
38 XT1
39 IC GND
40 X2
4.19 MHz
41 X1
42 VSS1 GND
43 LDRQ LDRQ IN LORD REQUEST
44 ERC ERC IN EVENT READ CANCEL
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 IN POWER OFF
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
2-4. TPRC1 (F258024PC)
1) General
TPRC1 is the LSI circuit of the peripheral circuits of the microcom-
puter required for thermal printer control.
Fig. 2-6
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
CG ROM
PHAI
INT
WAIT
RD
WR
D0~7
A0~23
CPU
(H8/500)
POF,RES
TPRC1
PB RAM
(SRAM)
Auto cutter Pulse motor
Thermal
head
Switch
sensor
SO
CLOCK
SI
LATCH
ST1~4
HCD
PHUP,PSP,
PST,POP
CTAO,CTBO PFP,PCRES XRS,XJS RVPON,JVPON RTRM,
P
TJM
BA0~15 BD0~2 BRD BWR BRAS (BRAS)
4 – 9