DESCRIPTION
The SM5L1/L2/L3 (SM5Lx series) are CMOS 4-bit single chip microcomputers operated on 1.5 V single power supply. This microcomputer integrates 4-bit parallel processing function, ROM, RAM, display RAM, 15-stage divider, two types of interrupt and four levels of subroutine stack. With a built-in LCD drive circuit for a maximum of 84/136/168 (SM5L1/L2/L3) elements, in a two-mode standby function, and a melody generator circuit in a single chip, the SM5Lx series permits the design of system configuration with a minimum of peripheral components. It can be used in a variety of products from handheld equipment to electrical appliances, such as audio timers, and also achieves lower power consumption.

FEATURES
• ROM capacity:
    – 2,048 × 8-bits (SM5L1)
    – 3,072 × 8-bits (SM5L2)
    – 4,096 × 8-bits (SM5L3)
• RAM capacity:
    – 69 × 4-bits, including 21 × 4-bits display RAM (SM5L1)
    – 130 × 4-bits, including 34 × 4-bits display RAM (SM5L2)
    – 170 × 4-bits, including 42 × 4-bits display RAM (SM5L3)
• 51 instruction sets
• Four levels of subroutine nesting
• I/O port:
    – One input
    – Five outputs
    – Eight input/outputs
• Interrupts:
    – Internal interrupt × 1 (divider overflow)
    – External interrupt × 1 (INTA)
• Built-in main clock oscillator for system clock
• Signal generation for real time clock
• Built-in 15 stage divider for real time clock
• Built-in LCD driver:
    – 84 segments (SM5L1), 136 segments (SM5L2), 168 segments (SM5L3), 1/2 bias, 1/4 duty cycle
• Built-in melody generator circuit:
    – Melody ROM
    – 160 steps (SM5L1), 256 steps (SM5L2/3)
    – Generating time (at 32.768 kHz)
    – 20 sec. (MAX.) (SM5L1)
    – 32 sec. (MAX.) (SM5L2/3)
• Instruction cycle time: 61 µs (TYP. at 32.768 kHz)
• Standby function
• Supply voltage: 1.5 V ± 20%
• Packages:
    – 60-pin QFP (QFP060-P-1414) (SM5L1)
    – 72-pin QFP (QFP072-P1010) (SM5L2)
    – 80-pin QFP (QFP080-P-1420) (SM5L2/3)