DESCRIPTION
The SM3512 is a CMOS 4-bit single-chip microcomputer for databank incorporating data memory RAM, LCD driver, key/switch input circuit, 8-bit parallel I/O port, 2 output ports, external memory control 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 :
   System clock (built-in CR oscillator) 250 kHz
   Timer (built-in CR oscillator) 32.8 kHz
   (external crystal) 32.768 kHz
• 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)