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參數(shù)資料
| 型號(hào)： | P89C739 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit Flash microcontrollers |
| 中文描述： | 8位閃存微控制器 |
| 文件頁(yè)數(shù)： | 59/64頁(yè) |
| 文件大?。?/td> | 360K |
| 代理商： | P89C739 |
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1998 Apr 07
59
Philips Semiconductors
Product specification
8-bit Flash microcontrollers
P89C738; P89C739
Fig.35 External data memory write cycle.
handbook, full pagewidth
MGK208
PORT 0
PORT 2
tLLAX
tAVLL
P2.0 to P2.7 or A8 to A15 from DPF
A0 to A15 from PCH
data output
A0 to A7
from RI or DPL
instr in
A0 to A7 from PCL
PSEN
tWHLH
tAVWL
tLLWL
tWLWH
tWHQX
tQVWX
WR
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:
t
AVLL
= time for address valid to ALE LOW
t
LLPL
= time for ALE LOW to PSEN LOW.
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