GENERAL DESCRIPTION
MSM6546/6546L is a 4-bit, low-power microcontroller manufactured in a CMOS silicon gate process. The microcontroller can be initialized and operated at the low supply voltage of 0.9 V. This device contains a crystal oscillator circuit, voltage converter circuits, a time base counter, a ROM, a RAM, a stack RAM, I/O ports, interrupt function components, a serial I/O port, a buzzer output circuit, an up/down counter, and LCD drivers.
This IC can be driven by one battery and is well suited to products that need to be operated with low power consumption.

FEATURES
• The IC can be initialized and operated even at a low voltage of 0.9 V.
• Low power consumption
• ROM : 4096 words · 17 bits
• RAM : 256 words · 4 bits
• I/O port
    Input/output port : 7 ports · 4 bits
    Input port : 1 port · 4 bits
• Interrupt functions (real-time interrupt, external interrupt, and serial interrupt)
• Serial I/O port : 8-bit sync communication
• Buzzer output circuit
• 4-bit decimal up/down counter
• 54 LCD drivers (up to 200 segments can be displayed)
• 75 instructions
• Minimum instruction execution time : 61 ms
• Operation under single 1.5 V power supply (MSM6546)
    A mask option allows the 3 V power supply to be used (MSM6546L).
• Built-in 32.768 kHz crystal oscillator circuit
• Package:
    100-pin plastic QFP (QFP100-P-1420-0.65-BK)
                                         : (Product name : MSM6546-xxGS-BK, MSM6546L-xxGS-BK)
    Chip
                                                                                                 xx indicates a code number.