st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 151

• Manufacturer Part Number: st10f269z1
• Description: St10f269 16-bit Mcu With Mac Unit, 256k Byte Flash Memory And 12k Byte Ram
• Manufacturer: STMicroelectronics

ST10F269
V
1. Theoretical minimum. The real minimum value depends on the duty cycle of the input clock signal. 32MHz is the maximum input frequency
when using an external crystal oscillator. However, 32MHz can be applied with an external clock source.
2. The input clock signal must reach the defined levels V
Figure 70 : External Clock Drive XTAL1
21.4.9 - Memory Cycle Variables
The tables below use three variables which are derived from the BUSCONx registers and represent the
special characteristics of the programmed memory cycle. The following table describes, how these
variables are to be computed.
Oscillator period
High time
Low time
Rise time
Fall time
ALE Extension
Memory Cycle Time wait states
Memory Tri-state Time
DD
= 5V
Parameter
10%, V
Description
SS
t
t
t
t
t
= 0V, T
OSC
1
2
3
4
Symbol
SR
SR
SR
SR
SR
A
= -40 to +125 °C (TQFP144 devices)
t
Minimum
1
31.25
12.5
12.5
–
–
f
CPU
2
2
1
= f
IL
Symbol
Maximum
and V
XTAL
V
3.125
3.125
IH2
t
t
t
A
C
F
–
–
–
IH2
2
2
t
.
2
t
3
Minimum
15.625
TCL x [ALECTL]
2TCL x (15 - [MCTC])
2TCL x (1 - [MTTC])
6.25
6.25
f
CPU
–
–
t
2
2
OSC
V
= f
IL
XTAL
Maximum Minimum Maximum
1.56
1.56
/ 2
–
–
–
2
2
Values
31.25 x N
F = 1.5/2,/2.5/3/4/5
12.5
12.5
f
CPU
–
–
2
2
= f
t
4
XTAL
3.125
3.125
x F
–
–
–
2
2
151/184
Unit
ns
ns
ns
ns
ns