DESCRIPTION
The SM3514 is a CMOS 4-bit single-chip microcomputer for databank incorporating data memory RAM, LCD driver, key input circuits and buzzer output circuit. By connecting an external crystal, a 1Hz timer interrupt is made possible for easier clock function.
FEATURES
• ROM capacity :
Program ROM 8 k x 23 bits
Character ROM 5 x 8 x 128 bits
• RAM capacity :
Working RAM 256 x 4 bits
Display RAM 60 x 8 bits
Data RAM 512 x 8 bits
• LCD display : 60 - segment x 8 - common
• I/O ports :
Buzzer output 1 bit (4 kHz)
Key input 7 bits
• Standby release : 2 events (2 Hz signal, key input)
• Built-in oscillator :
System clock (built-in CR oscillator) 300 kHz
Timer (built-in CR oscillator) 32.8 kHz
(external crystal) 32.768 kHz
• Instruction cycle time : 10 µs
• Operating temperature : –10 to +60°C
• Supply voltage : 2.5 to 3.4 V
• Package : 100-pin QFP (QFP100-P-1420)