AN394 - APPLICATION NOTE

8/10

Figure 10. Oscilloscope Plot, R = 10 k

Ω, C = 100 pF, Rp = 50 kΩ

PROGRAMMING MODE: ACKNOWLEDGEMENT OF READY/BUSY STATUS

During a self-timed programming cycle, MICROWIRE EEPROM devices use the Q output to indicate the

ready/busy status of the chip. This occurs during the execution of commands such as: WRITE, ERASE,

WRAL and ERAL.

The self-timed programming cycle begins with the falling edge of S, at the end of a programming com-

mand. The S pin must be kept low for a minimum of tSLSH (as described in the data sheet). The Q output

remains in its high impedance state as long as S is low. If S is brought high for clocking-in a new command,

Q comes out of its high impedance state, and indicates the Ready/Busy status of the chip (0 = Busy,

1 = Ready).

Figure 11. Acknowledgement of the Ready/Busy Signal on the Q Output

Ai02428

5V

C clock

D/Q bus

Q output

D driver enable

(1 = disabled)

10

µS

Ai02429

5V

C clock

D/Q bus

D driver enable

(1 = disabled)

10

µS