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FM93CS56LN 데이터시트(PDF) 8 Page - Fairchild Semiconductor |
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FM93CS56LN 데이터시트(HTML) 8 Page - Fairchild Semiconductor |
8 / 16 page 8 www.fairchildsemi.com FM93CS56 Rev. C.1 instruction should be issued as listed under Table1. After inputting the last bit of address (A0 bit), CS signal must be brought low before the next rising edge of the SK clock. This falling edge of the CS initiates the self-timed programming cycle. It takes t WP time (Refer appropriate DC and AC Electrical Characteristics table) for the internal programming cycle to finish. During this time, the device remains busy and is not ready for another instruction. Status of the internal programming can be polled as described under WRITE instruction description. While the device is busy, it is recommended that no new instruction be issued. The Protect Register is permanently write-protected at the end of this cycle. Refer Protect Register Disable cycle diagram. Clearing of Ready/Busy status When programming is in progress, the Data-Out pin will display the programming status as either BUSY (low) or READY (high) when CS is brought high (DO output will be tri-stated when CS is low). To restate, during programming, the CS pin may be brought high and low any number of times to view the programming status without affecting the programming operation. Once programming is completed (Output in READY state), the output is ‘cleared’ (returned to normal tri-state condition) by clocking in a Start Bit. After the Start Bit is clocked in, the output will return to a tri-stated condition. When clocked in, this Start Bit can be the first bit in a command string, or CS can be brought low again to reset all internal circuits. Refer Clearing Ready Status diagram. Related Document Application Note: AN758 - Using Fairchild’s MICROWIRE™ EE- PROM. |
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