UPI-C42/UPI-L42
WAVEFORMS (Continued)
COMBINATION PROGRAM/VERIFY MODE
290414 – 25
NOTES:
1.A0 must be held low (0V) during program/verify modes.
2.For VIH, VIH1, VIL, VIL1, VDDH, and VDDL, please consult the D.C. Characteristics Table.
3.When programming the 87C42, a 0.1 mF capacitor is required across VDD and ground to suppress spurious voltage
transients which can damage the device.
VERIFY MODE
290414 – 26
NOTES:
1.PROG must float if EA is low.
2.PROG must float or e 5V when EA is high.
3.P10 – P17 e 5V or must float.
4.P24 – P27 e 5V or must float.
5.A0 must be held low during programming/verify modes.
22
