8-pin SOP (150/208mil)/ PDIP (300mil)，Figure 3.2 8-Contact 6 x 5 mm WSON
The HK25Q80C of non-volatile flash memory devices supports the standard Serial Peripheral Interface (SPI). Traditional SPI single bit serial input and output (Single I/O or SIO) is supported as well as optional two bit (Dual I/O or DIO). This multiple width interface is called SPI Multi-I/O or MIO.
The DIO protocol uses Serial Input (DI) and Serial Output (DO) for data transfer. The DIO protocols use IO0 and IO1 to input or output two bits of data in each clock cycle. The Write Protect (WP#) input signal option allows hardware control over data protection. Software controlled commands can also manage data protection. The SPI clock frequencies of up to 100MHz are supported allowing equivalent clock rates of 100MHz for Dual Output. The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction.