DESCRIPTION

The SM3513 is a CMOS 4-bit single-chip microcomputer for databank incorporating data memoryRAM, LCD driver (the output is adjustable in 16 steps for various contrast), key/switch input circuit, 8-bit parallel I/O port, 3 output ports, external memory control circuit, buzzer circuit and voltage detector circuit. One of three ports contains special output circuit for infrared (IR) communication. It is easy to realize timer function by timer signal interrupt since the oscillator circuit is built-in.

FEATURES

• ROM capacity :

   Program ROM 24 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 32 bits

   Data RAM 512 x 8 bits

• Memory expansion (external) : 16 M x 8 bits x 4

• Buil-in battery detector

• LCD display : 74-segment x 32-common

• I/O ports :

   Parallel I/O 8 bits

   Input 2 bits

   Output 3 bits

   Buzzer output 1 bit (4 kHz)

   Key input 6 bits

• Standby release : 2 events (Timer signal, key input)

• LCD contrast adjustable : 16 levels

• 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 : 3.8 to 6.0 V

• Package : 160-pin QFP (QFP160-P-2828)

                                [Test Sample only]