| 摘要 |
<p>In the present invention a write protection circuit capable of being used in a memory card is disclosed. The write protection circuit (40) receives an externally supplied write protect signal (20) and generates a protection signal (22) for use with an associated electrically alterable non-volatile memory. The write protection circuit (40) has two non-volatile storage registers (42, 44), each storing a single bit. Logic means receives a bit from a first register (44) and passes the externally supplied write protect signal as the internally generated protection signal when the bit is in a '1' state. When the bit is in another state, the signal from the second register (42) is used as the protection signal (22).</p> |
