| Pin | Name | Input /Output | Functions |
| Vcc, Vss | Power supply input | | Apply 5 V+ 0.5 V to Vcc, and o V to Vss. |
| MDO | MDO | Input | Connect this pin to Vss. |
| MD1 | MD1 | Input | Connect this pin to Vss via a resistor of 10 kl t0 100 kl . |
| RESET | Reset input | Input | The reset input pin. |
| XIN | Clock input | Input | Connect a ceramic oscillator between the XIN and XOUT pins, or input an external |
| XOUT | Clock output | Output | clock from the XIN pin with the XOUT pin left open. |
| AVcc, AVss | Analog supply input | | Connect AVcc to Vcc, and AVss to Vss. |
| VREF | Reference voltage input | Input | Input an arbitrary level within the range of Vss-Vcc. (This is not used in the flash memoW serial l/0 mode.) |
| P10-P1-r | Input port P1 | Input | Input "H" or "L", or leave them open. (This is not used in the flash memory serial l/0 mode.) |
| P20-P23, P27 P24 P2s P26 | Input port P2 _SCLK input SDA l/0 BUSY output | _lnput_ _Input_ 1/0 Output | Input "H" or "L", or leave them open. (This is not used in the flash memory serial l/0 mode.) This is an input pin for a serial clock. This is an l/0 pin for serial data. Connect this pin to Vcc via a resistor (about l_k I ). This is an output pin for the BUSY signal. |
| P60UTCUT | P60UTCUT input | Input | Input "H". |
| P55-P57 | Input port P5 | Input | Input "H" or "L", or leave them open. (This is not used in the flash memory serial l/0 mode.) |
| P60-P6s | Input port P6 | Input | Input "H" or "L", or leave them open. (This is not used in the flash memory serial l/0 mode.) |
| P70-P74 | Input port P7 | Input | Input "H" or "L", or leave them open. (This is not used in the flash memory serial l/0 mode.) |
| VCONT | Filter circuit connection | | Connect this pin to the filter circuit, or leave this pin open. (This is not used in the flash memory serial l/0 mode.) |
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