SM79164 micro-controller equivalent, 8-bit micro-controller.
2.4V ~ 3.0V For V Version Working voltage: 3.0V ~ 3.6V For L Version 4.5V ~ 5.5V For C Version General 8052 family compatible 12 clocks per machine cycle 64K byte on chip.
which demand up to 32 I/O pins for PDIP package or up to 36 I/O pins for PLCC/QFP package, or applications which need up.
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