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SM3518 数据手册 - Sharp（夏普）
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Sharp（夏普）
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SM3518数据手册
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etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
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 1Hz 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 :
• 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)
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
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