封装SOP8/SOT23-6
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The program memory space of NY8A051H is 1K words. Therefore, the Program Counter (PC) is 10-bit wide in order to address any location of program memory.
Some locations of program memory are reserved as interrupt entrance. Power-On Reset vector is located at 0x000. Software interrupt vector is located at 0x001. Internal and external hardware interrupt vector is located at 0x008.
NY8A051H provides instruction CALL, GOTOA, CALLA to address 256 location of program space. NY8A051H provides instruction GOTO to address 512 location of program space. NY8A051H also provides instructions LCALL and LGOTO to address any location of program space.
When a call or interrupt is happening, next ROM address is written to top of the stack, when RET, RETIA or RETIE instruction is executed, the top of stack data is read and load to PC
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