p80c528efp NXP Semiconductors, p80c528efp Datasheet - Page 67

• Manufacturer Part Number: p80c528efp
• Description: 8-bit Microcontrollers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
25.1
Oscillator:
Timing symbols (acronyms):
Each timing symbol has five characters. The first character
is always a 't' (= time). the remaining four characters of the
symbol (typed in subscript), depending on their relative
positions, indicate the name of a signal or the logical status
of that signal. the designations are as follows:
Examples:
1997 Dec 15
f
t
A =address
C = clock
D = input data
H = logic level HIGH
I = instruction (program memory contents)
L = Logic level LOW or ALE
P = PSEN
Q = output data
R = RD signal
t = time
V = valid
W = WR signal
X = no longer a valid logic level
Z = float
t
t
8-bit microcontrollers
CLK
CK
AVLL
LLPL
= clock period
= clock frequency
Timing symbol definitions
= time for ALE LOW to PSEN LOW
= time for address valid to ALE LOW
67
P83C524; P80C528; P83C528
Product specification