MICROCONTROLLER LINE   8-Bit MCU for General Purpose Product EM No. Mask/OTP Version Voltage ROM (13-bit) RAM (8-bit) I/O Pins INT (E/I) Timer Modules (8-bit) WDT Pin No. Special Function EM78P153S [English] [Simplified Chinese] OTP/Mask 2.3~5.5 1K 32 11I/O & 1 I 3(1/2) 1 YES 14 IRC EM78P156EL [English] [Simplified Chinese] OTP 2.3~5.5 1K 48 12 3(1/2) 1 YES 18/20 - EM78P156EH [English] OTP 3.2~5.5 1K 48 12 3(1/2) 1 YES 18/20 - EM78156E [English] Mask 2.3~5.5 1K 48 12 3(1/2) 1 YES 18/20 - EM78P156N/T [English] OTP 2.5/2.7~5.5 1K 48 12 3(1/2) 1 YES 18/20 - EM78P257A/B [English] [Simplified Chinese] OTP 2.3~5.5 2K 80 16/18 5(1/4) 3/4 YES 18/20 IR; MOUSE; PWM EM78P447SA/B [English] [Simplified Chinese] OTP 2.3~5.5 4K 148 20/24 2(1/1) 1 YES 28/32 - EM78447SA/B [English] Mask 2.3~5.5 4K 148 20/24 2(1/1) 1 YES 28/32 - EM78P451 [English] [Simplified Chinese] OTP 2.3~5.5 4K 140 35 4(1/3) 2 YES 40,44 SPI EM78451 [English] Mask 2.3~5.5 4K 140 35 4(1/3) 2 YES 40,44 SPI EM78P458/9 [English] [Simplified Chinese] OTP 2.3~5.5 4K 96 16 6(1/5) 3 YES 20/24 AD; PWM EM78458/9 [English] Mask 2.3~5.5 4K 96 16 6(1/5) 3 YES 20/24 AD; PWM Note: *-- Under development. OTP- One Time Programming MTP- Multi-Time Programming POVD- Power On Voltage Detector SPI- Serial Peripheral Interface AD- Analog to Digit Converter WDT- Watch Dog Timer IRC- Oscillator is Internal RC