Description
The GMS81508B/16B/24B are advanced CMOS 8-bit microcontrollers with 8K/16K/24K bytes of ROM and 64pin package. And the GMS82512/16/24 are the same except for 12K/16K/24K bytes of ROM and 42pin package. The GMS825xx is a cut-down product of GMS815xxB microcontroller, that is, the function and package are reduced. These are powerful microcontrollers which provide a highly flexible and cost effective solution to many general application. These includes several peripheral functions such as Timer, A/D converter, Programmable buzzer driver, Serial I/O communication(GMS815xxB only), Pulse Width Modulation function( GMS815xxB only), etc. The RAM, ROM, and I/O are placed on the same memory map in addition to simple instruction set. Also, they support power saving mode to reduce power consumption.

Features
• 8K/16K/24K Bytes On-chip Program ROM (12K/16K/24K Bytes in GMS825xx)
• 448 Bytes of On-chip Data RAM (Included stack memory)
• Minimum Instruction Execution Time 0.5µs at 8MHz
• One 8-bit Basic Interval Timer
• Four 8-bit Timer/Event counter or Two 16-bit Timer/Event counter
• One 6-bit Watchdog timer
• Eight channel 8-bit A/D converter (Four channel in GMS825xx)
• Two channel 8-bit PWM (Not support in GMS825xx)
• One 8-bit Serial Communication Interface (Not support in GMS825xx)
• Four External Interrupt input ports
• Buzzer Driving port
    - 500Hz ~ 250kHz@8MHz
• 52 I/O Ports, 4 Input Ports (35 I/O ports in GMS825xx)
• Twelve Interrupt sources
    - Basic Interval Timer: 1
    - External input: 4
    - Timer/Event counter: 4
    - ADC: 1
    - Serial Interface: 1(Not support in GMS825xx)
    - WDT: 1
• Built in Noise Immunity Circuit