w78e54 Winbond Electronics Corp America, w78e54 Datasheet - Page 15

• Manufacturer Part Number: w78e54
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

Notes:
1. The clock may be stopped indefinitely in either state.
2. The T
3. There are no duty cycle requirements on the XTAL1 input.
Program Fetch Cycle
Notes:
1. P0.0 P0.7, P2.0 P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 T
3. Data have been latched internally prior to PSEN going high.
4. " " (due to buffer driving delay and wire loading) is 20 nS.
Data Read Cycle
Notes:
1. Data memory access time is 8 T
2. " " (due to buffer driving delay and wire loading) is 20 nS.
Operating Speed
Clock Period
Clock High
Clock Low
ALE Low to RD Low
RD Low to Data Valid
Data Hold from RD High
Data Float from RD High
RD Pulse Width
Address Valid to ALE Low
Address Hold from ALE Low
ALE Low to PSEN Low
Data Hold after PSEN High
Data Float after PSEN High
ALE Pulse Width
PSEN Low to Data Valid
PSEN Pulse Width
CP
PARAMETER
specification is used as a reference in other specifications.
PARAMETER
PARAMETER
CP
.
CP
.
SYMBOL
F
T
T
T
SYMBOL
SYMBOL
OP
CH
CP
CL
T
T
T
T
T
T
T
T
T
T
T
T
T
ALW
PSW
PDH
AAS
AAH
PDA
PDZ
APL
DAR
DDA
DDH
DDZ
DRD
MIN.
- 15 -
3 T
6 T
25
10
10
1 T
1 T
1 T
2 T
3 T
0
MIN.
MIN.
CP
CP
0
0
CP
CP
CP
CP
CP
-
0
0
-
-
-
-
-
-
-
-
TYP.
6 T
TYP.
-
-
-
-
2 T
3 T
TYP.
Publication Release Date: November 1997
-
-
-
-
CP
-
-
-
-
-
-
CP
CP
MAX.
3 T
40
2 T
1 T
1 T
MAX.
-
-
-
4 T
2 T
2 T
MAX.
CP
-
-
-
-
-
CP
CP
CP
-
CP
CP
CP
+
UNIT
MHz
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
UNIT
nS
nS
nS
nS
nS
W78E54
Revision A2
NOTES
NOTES
NOTE
1, 4
1, 2
1
2
3
3
4
4
2
3
4
4
S
1
2