Read Sharp ER-A280 / ER-A280N / ER-A280F (serv.man5) Service Manual online
ER-A280F/A280N (V)
HARDWARE DESCRIPTIONS
4 – 4
Caution: (*)---N-ch open drain terminal
*1: At POFF, the output is driven to LOW after completion of service-
interruption process.
2)
G/A
For I/O expansion and control support of the MPU, G/A is set to realize
the function.
the function.
The major functions of G/A are as shown below.
1. Equivalent to RS232 16450 x 4
2. Timer x4 (BAUDOUT of 16450)
3. Interrupt control
4. GPIO x 16 (Printer control signal, LED segment signal, etc.)
5. GPI x 7 (Used as the key return signal)
6. Fiscal memory control (Not used)
7. FRONT DISPLAY control
8. Decoder/address control
9. Wait control (FRONT DISPLAY area/Program memory area)
■ Decoder control
The following decode signals are generated.
56
P36/A14 A14
O-X
O-X
O-L
ADDRESS
BUS
BUS
57
P35/A13 A13
O-X
O-X
O-L
ADDRESS
BUS
BUS
58
P34/A12 A12
O-X
O-X
O-L
ADDRESS
BUS
BUS
59
P33/A11 A11
O-X
O-X
O-L
ADDRESS
BUS
BUS
60
P32/A10 A10
O-X
O-X
O-L
ADDRESS
BUS
BUS
61
P31/A9
A9
O-X
O-X
O-L
ADDRESS
BUS
BUS
62
VCC2
VCC
-
-
63
P30/A8
A8
O-X
O-X
O-L
ADDRESS
BUS
BUS
64
VSS
VSS
-
-
65
P27/A7
A7
O-X
O-X
O-L
ADDRESS
BUS
BUS
66
P26/A6
A6
O-X
O-X
O-L
ADDRESS
BUS
BUS
67
P25/A5
A5
O-X
O-X
O-L
ADDRESS
BUS
BUS
68
P24/A4
A4
O-X
O-X
O-L
ADDRESS
BUS
BUS
69
P23/A3
A3
O-X
O-X
O-L
ADDRESS
BUS
BUS
70
P22/A2
A2
O-X
O-X
O-L
ADDRESS
BUS
BUS
71
P21/A1
A1
O-X
O-X
O-L
ADDRESS
BUS
BUS
72
P20/A0
A0
O-X
O-X
O-L
ADDRESS
BUS
BUS
73
P 1 7 /
INT5#
INT5#
INTGA#
I
I
I
G/A interrupt
signal
signal
74
P 1 6 /
INT4#
INT4#
KRINT#
I
I
I
MODE/KEY
RETURN X INT
RETURN X INT
75
P 1 5 /
INT3#
INT3#
ACOFF#
I
I
I
AC OFF detec-
tion signal (For
FISCAL only)
tion signal (For
FISCAL only)
76
P14
DRAWER
O-L
O-L
O-L
DRAWER con-
trol signal
trol signal
77
P13
KS3
O-H
O-H
I
KEY STRB
78
P12
KS2
O-H
O-H
I
KEY STRB
79
P11
KS1
O-H
O-H
I
KEY STRB
80
P10
KS0
O-H
O-H
I
KEY STRB
81
P07/D7
DB7
I/O-X
I/O-X
O-L
DATA BUS
82
P06/D6
DB6
I/O-X
I/O-X
O-L
DATA BUS
83
P05/D5
DB5
I/O-X
I/O
O-L
DATA BUS
84
P04/D4
DB4
I/O-X
I/O
O-L
DATA BUS
85
P03/D3
DB3
I/O-X
I/O
O-L
DATA BUS
86
P02/D2
DB2
I/O-X
I/O
O-L
DATA BUS
87
P01/D1
DB1
I/O-X
I/O
O-L
DATA BUS
88
P00/D0
DB0
I/O-X
I/O
O-L
DATA BUS
89
P 1 0 7 /
AN7
AN7
FVPON
O-L
O-L
O-L
FMC WR volt-
age ON signal
(ON at H)
age ON signal
(ON at H)
Port
name
Signal
name
Initial setting
DEEP
STAND-
BY
Remark
Nor
mal
mal
IPL
90
P 1 0 6 /
AN6
AN6
USBRES
#
#
O-
L
3H
O-
L
3H
I
USB controller
reset signal
reset signal
91
P 1 0 5 /
AN5
AN5
F R DY /
BY#
BY#
I
I
I
FROM RDY/BY
signal
signal
92
P 1 0 4 /
AN4
AN4
VREF
I(AD)
I(AD)
I
VREF input
(VREF) TYP
2.495V
(VREF) TYP
2.495V
93
P 1 0 3 /
AN3
AN3
VBAT2
I(AD)
I(AD)
I
Battery moni-
tor *Li-ION
(Not used)
tor *Li-ION
(Not used)
94
P 1 0 2 /
AN2
AN2
VBAT1
I(AD)
I(AD)
I
Battery moni-
tor *Ni-MH
tor *Ni-MH
95
P 1 0 1 /
AN1
AN1
VH EAD _
CHK
CHK
I(AD)
I(AD)
I
PRINTER
HEAD voltage
monitor (A/D)
HEAD voltage
monitor (A/D)
96
AVSS
VSS
-
-
-
97
P 1 0 0 /
AN0
AN0
PTM
I(AD)
I(AD)
I
PRINTER
HEAD TEMP
SENS(A/D)
HEAD TEMP
SENS(A/D)
98
VREF
VREF
I
I
I
Reference volt-
age
age
99
AVCC
AVCC
-
-
-
100 P97
BAT_AD
O-L
O-L
O-L
Battery voltage
AD ON signal
(ON at H)
AD ON signal
(ON at H)
Address
Decode signal
Remark
04000h - 1FFFFh
(Mapping area)
(Mapping area)
30000h - 6FFFFh
CS_SRAM#
SRAM
28000h - 29FFFh
CS1_00#
(USB CNTL)
2A000h - 2BFFFh
CS1_01#
EFT
2C000h - 2DFFFh
CS1_10#
FRONT DISP (LCD)
2E000h - 2FFFFh
CS_GA#
(GA internal signal)
(GA internal signal)
For GA built-in register
Port
name
Signal
name
Initial setting
DEEP
STAND-
BY
Remark
Nor
mal
mal
IPL
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