SM3518 Datasheet, PDF (1/3 Pages) Sharp Electrionic Components – 4-Bit Single-Chip Microcomputer(For Data Bank Use)

SM3518
DESCRIPTION
The SM3518 is a CMOS 4-bit single-chip micro-
computer for databank incorporating data memory
RAM, LCD driver (the output is adjustable in 16
steps for various contrast), key/switch input circuit,
8-bit parallel I/O port, 2 output ports and buzzer
output circuit. The chip also has memory expansion
controlling feature. One of two ports contains spe-
cial output circuit for infrared (IR) communication.
By connecting an external crystal, a 1 Hz timer is
made possible for easier clock function.
FEATURES
• ROM capacity :
Program ROM 12 k x 23 bits
Character ROM 6 x 8 x 256 bits
Constant ROM 1 k x 4 bits
• RAM capacity :
Working RAM 256 x 4 bits
Display RAM 74 x 16 bits
Data RAM
3 k x 8 bits
• Memory expansion (external) : 1M x 8 bits x 3
• LCD display : 74 - segment x 16 - common
• I/O ports :
Parallel I/O
8 bits
Input
2 bits
Output
2 bits
Buzzer output 1 bit (4 kHz)
Key input
6 bits
• Standby release : 2 events (2 Hz signal, key input)
• Built-in oscillator :
System clock (built-in CR oscillator) 1 MHz
(external ceramic resonator) 1 MHz
Timer (built-in CR oscillator)
32.8 kHz
(external crystal)
32.768 kHz
• Instruction cycle time : 3 µs
• Operating temperature : –10 to +60°C
• Supply voltage : 2.5 to 5.5 V
• Package : 128-pin QFP (QFP128-P-2828)
[Test Sample only]
SM3518
4-Bit Single-Chip Microcomputer
(For Data Bank Use)
In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices shown in catalogs, data books,
etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
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