• OTP ROM size: 1K * 16 bits
• RAM size: 48 * 8 bits
• 4-levels stack buffer
• Bi-directional I/O: P0, P1, P5
• Internal pull-up resistor: P0, P1, P5
• Internal pull-down resistor: P5.0~P5.3
• 40mA high sink current GPIO pin: P5.0~P5.3, P5.5
• Programmable open-drain: P1.0
• Level trigger wakeup input port: P0, P1
• 1 external interrupt: P0.0 (INT0)
• 2 internal interrupts: T0, TC0
• 8-bit timer: T0
• 8-bit counter / timer, programmable PWM: TC0
• One channel 2K/4K buzzer output: P5.5
• On-chip watchdog
• Internal High Clock: 16MHz RC oscillator
• External High Clock: Crystal type up to 16MHz / RC type up to 10MHz
• Internal Low Clock: RC oscillator, about 16KHz at 3V, 32KHz at 5V
• Low power option for power-saving
• One clock per instruction cycle
• Most of instructions are one cycle only
• All ROM area lookup table function(MOVC)

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