SM5964A micro-controller equivalent, 8-bit micro-controller.
Port Pin Alternative function P3.0 RxD UART input P3.1 TxD UART output P3.2 #EX0 external interrupt 0 P3.3 #EX1 external interrupt 1 P3.4 T0: Timer 0 external input P3.5.
The on chip flash memory can store data while the program is running. It also can upgrade the user program by down-load.
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