80C32E_03 Datasheet, PDF (12/20 Pages) AIMTEC – Rad. Tolerant 8-bit ROMless Microcontroller

AC Parameters
Each timing symbol has 5 characters. The first character is always a “T” (stands for
time). The other characters, depending on their positions, stand for the name of a signal
or the logical status of that signal. The following is a list of all the characters and what
they stand for.
Example:
T_AVLL = Time for Address Valid to ALE Low.
T_LLPL = Time for ALE Low to PSEN Low.
TA = -55°C to +125°C (Military temperature range); V_SS = 0V; V_CC = 5V ± 10%;
Load capacitance for Port 0, ALE and PSEN = 100 pF; Load capacitance for all other
outputs = 80 pF.
Table 4. External Program Memory Characteristics (ns)
Symbol
T_LHLL
T_AVLL
T_LLAX
T_LLIV
T_LLPL
T_PLPH
T_PLIV
T_PXIX
T_PXIZ
T_PXAV
T_AVIV
T_PLAZ
Parameter
ALE Pulse Width
Address Valid to ALE
Address Hold After ALE
ALE to Valid Instruction In
ALE to PSEN
PSEN Pulse Width
PSEN to Valid Instruction In
Input Instruction Hold After PSEN
Input Instruction Float After PSEN
PSEN to Address Valid
Address to Valid Instruction In
PSEN Low to Address Float
Figure 7. External Program Memory Read Cycle
ALE
T_LHLL
T_LLIV
T_LLPL
T_PLPH
12 T_CLCL
PSEN
PORT 0 INSTR IN
T_LLAX
T_AVLL
A0-A7
T_PLIV
TPLAZ
T_PXIX
INSTR IN
T_PXAV
T_PXIZ
A0-A7
PORT 2
ADDRESS
OR SFR-P2
T_AVIV
ADDRESS A8-A15
INSTR IN
ADDRESS A8-A15
30 MHz
Min Max
60
15
35
100
25
80
65
0
30
35
130
6
12 80C32E
4149M–AERO–06/03