P89C738ABB View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'P89C738ABB' PDF : 64 Pages View PDF
Philips Semiconductors
8-bit Flash microcontrollers
Product specification
P89C738; P89C739
handbook, fullApLagEewidth
PSEN
WR
PORT 0
tAVWL
tLLWL
tAVLL
tLLAX
A0 to A7
from RI or DPL
tWHLH
tWLWH
tQVWX
data output
tWHQX
A0 to A7 from PCL
instr in
PORT 2
P2.0 to P2.7 or A8 to A15 from DPF
Fig.35 External data memory write cycle.
A0 to A15 from PCH
MGK208
21.3 Timing symbol naming conventions
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:
• 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.
Examples:
tAVLL = time for address valid to ALE LOW
tLLPL = time for ALE LOW to PSEN LOW.
1998 Apr 07
59
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