Read Sharp AR-BD14 (serv.man5) Service Manual online
I. NVRAM section
This is the SRAM (8KByte) having the backup function of various set
values used for printer control.
values used for printer control.
NVRAM Block (DS1643)
Features
•
Form, fit, and function compatible with the MK48T08 Timekeeping
RAM
RAM
•
Integrated NV SRAM, real time clock, crystal, power fail control
circuit and lithium energy source
circuit and lithium energy source
•
Standard JEDEC bytewide 8K
×
8 static RAM pinout
•
Clock registers are accessed identical to the static RAM. These
registers are resident in the eight top RAM locations.
registers are resident in the eight top RAM locations.
•
Totally nonvolatile with over 10 years of operation in the absence
of power
of power
•
Access times of 120 ns and 150 ns
•
Quartz accuracy
±
1 minute a month @ 25°C, factory calibrated
•
BCD coded year, month, date, day, hours, minutes, and seconds
•
Power fail write protection allows for
±
10% V
CC
power supply
tolerance
•
Optional Low Profile Module (LPM)
– Fits into standard 52-pin PLCC surface mountable socket
– 225 mil package height
Pin Assignment
GT-32011
373
System-Bus
16bit I/O bus (7:0)
Address-Bus (13:1)
ALE
/IOCS0
CPU
R3081
NVRAM
8KB
8bit-width
NC
1
A12
2
A7
3
A6
4
A5
5
A4
6
A3
7
A2
8
A1
9
A0
10
DQ0
11
DQ1
12
DQ2
13
GND
14
VCC
28
WE
27
CE2
26
A8
25
A9
24
A11
23
OE
22
A10
21
CE
20
DQ7
19
DQ6
18
DQ5
17
DQ4
16
DQ3
15
28-Pin Encapsulated Package
(700 Mil Extended)
Pin Description
Pin
No.
Pin
Name
Signal Name
Description
Pin
No.
Pin
Name
Signal Name
Description
1
NC
/RDY_BUSY BUSY signal of this device
15
DQ3
IODATA3
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
Data bus.
directly to bits of the bi-directional I/O
Data bus.
2
A12
A13
Address Bus
16
DQ4
IODATA4
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
Data bus.
directly to bits of the bi-directional I/O
Data bus.
3
A7
A8
Address Bus
17
DQ5
IODATA5
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
Data bus.
directly to bits of the bi-directional I/O
Data bus.
4
A6
A7
Address Bus
18
DQ6
IODATA6
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
Data bus.
directly to bits of the bi-directional I/O
Data bus.
5
A5
A6
Address Bus
19
DQ7
IODATA7
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
Data bus.
directly to bits of the bi-directional I/O
Data bus.
6
A4
A5
Address Bus
20
/CE
/IOCS0
Input/Output Chip Select: connects to a
chip select for the 8-bit I/O Data bus.
chip select for the 8-bit I/O Data bus.
7
A3
A4
Address Bus
21
A10
A11
Address Bus
8
A2
A3
Address Bus
22
/OE
/IOCRD
Input/Output Device Read: connects
directly to a chip ASIC: GT32011 /IORD.
directly to a chip ASIC: GT32011 /IORD.
9
A1
A2
Address Bus
23
A11
A12
Address Bus
10
A0
EA1
Address Bus
24
A9
A10
Address Bus
11
DQ0
IODATA0
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
directly to bits of the bi-directional I/O
25
A8
A9
Address Bus
12
DQ1
IODATA1
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
directly to bits of the bi-directional I/O
26
CE2
IOCS0
Input/Output Chip Select: connects to a
chip select for the 8-bit I/O Data bus.
chip select for the 8-bit I/O Data bus.
13
DQ2
IODATA2
Input/Output Device Data: connects
directly to bits of the bi-directional I/O
directly to bits of the bi-directional I/O
27
/WE
/IOWR
Input/Ouput Device Write: connects
directly to a chip ASIC: GT32011 /IOWR.
directly to a chip ASIC: GT32011 /IOWR.
14
GND
GND
Ground
28
VCC
+5V
Power Voltage
– 36 –
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