Universal Peripheral Interface User's Manual

UPI-C42/UPI-L42
WAVEFORMS (Continued)
COMBINATION PROGRAM/VERIFY MODE
290414–25
NOTES:
1. A
0
must be held low (0V) during program/verify modes.
2. For V
IH
,V
IH1
,V
IL
,V
IL1
,V
DDH
, and V
DDL
, please consult the D.C. Characteristics Table.
3. When programming the 87C42, a 0.1 mF capacitor is required across V
DD
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. P
10
–P
17
e
5V or must float.
4. P
24
–P
27
e
5V or must float.
5. A
0
must be held low during programming/verify modes.
22