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SM3512 数据手册 - Sharp（夏普）
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SM3512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.
SM3512
DESCRIPTION
The SM3512 is a CMOS 4-bit single-chip micro-
computer for databank incorporating data memory
RAM, LCD driver, key/switch input circuit, 8-bit par-
allel I/O port, 2 output ports, external memory con-
trol circuit, and buzzer output circuit.
FEATURES
• ROM capacity :
Program ROM 8 k x 23 bits
Character ROM 5 x 9 x 128 bits
Constant ROM 208 x 4 bits
• RAM capacity :
Working RAM 256 x 4 bits
Display RAM 60 x 9 bits
Data RAM 8 k x 8 bits
• Memory expansion (external) : 8 k x 8 bits
• LCD display : 60-segment x 9-common
• I/O ports :
Parallel I/O 8 bits
Input 1 bit
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 : 12 µs
• Operating temperature : –10 to +60°C
• Supply voltage : 2.5 to 3.4 V
• Package : 100-pin QFP (QFP100-P-1420)
SM3512
4-Bit Single-Chip Microcomputer
(For Data Bank Use)
System clock (built-in CR oscillator) 250 kHz
Timer (built-in CR oscillator) 32.8 kHz
(external crystal)
32.768 kHz
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