SyncMOS Technologies International. Inc.
SM79108
Tm.III External Data Memory Write Cycle
#PSEN
TYHLH
TLHLL
ALE
TLLYL
TWLWH
TQVWH
TAVLL
#WR
TQVWX
TLLAX
TWHQX
A0-A7
from Ri or DPL
A0-A7
From PCL
INSTRL
IN
DATA OUT
PORT 0
TAVYL
A8-A15 from PCH
P2.0-P2.7 or A8-A15 from DPH
PORT 2
Application Reference
Valid for SM79108
X’tal
C1
C2
R
3MHz
6MHz
30pF
30pF
open
12MHz
16MHz
30pF
30pF
open
30pF
30pF
open
30pF
30pF
open
X’tal
C1
C2
R
20MHz
22pF
22pF
open
25MHz
15pF
33MHz
5pF
40MHz
2pF
15pF
5pF
2pF
62KΩ
6.8KΩ
4.7KΩ
XI
NOTE: Oscillation circuit may differs with different crystal or ceramic
resonator in higher oscillation frequency which was due to each
X'tal
SM79108
crystal or ceramic resonator has its own characteristics.
User should check with the crystal or ceramic resonator manufacturer
for appropriate value of external components.
R
X2
C2
C1
21/26
Ver 2.1
SM79108 08/2006
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
