ST10 STMICROELECTRONICS [STMicroelectronics], ST10 Datasheet - Page 45

• Manufacturer Part Number: ST10
• Description: 16-BIT MCU WITH 32K BYTE ROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

XX - ELECTRICAL CHARACTERISTICS (continued)
XX.4.8 - External clock drive XTAL1
V
Notes 1. Theoretical minimum. The real minimum value depends on the duty cycle of the input clock signal.
Figure 13 : External clock drive XTAL1
XX.4.9 - Multiplexed bus
V
C
C
ALE cycle time = 6 TCL + 2t
Table 18 : Multiplexed bus characteristics
DD
DD
t
L
L
OSC
Symbol
t
t
t
t
t
t
t
t
t
Symbol
1
2
3
4
(for Port0, Port1, Port 4, ALE, RD, WR, BHE, CLKOUT) = 100pF,
(for Port 6, CS) = 100pF
5
6
7
8
9
= 5V
= 5V
2. 25MHz is the maximum input frequency when using an external crystal oscillator; however, 50MHz can be applied with an external
clock source.
3. The input clock signal must reach the defined levels V
SR
SR
SR
SR
SR
CC
CC
CC
CC
CC
10%, V
10%, V
ALE high time
Address setup to ALE
Address hold after ALE
ALE falling edge to RD, WR
(with RW-delay)
ALE falling edge to RD, WR (no
RW-delay)
Oscillator period
High time
Low time
Rise time
Fall time
SS
SS
= 0V, T
= 0V, T
Parameter
Parameter
A
A
A
+ t
= -40 to +125 C unless otherwise specified.
= -40 to +125 C
t
C
1
+ t
F
(120ns at 25MHz CPU clock without wait states)
V
Min.
40
18
18
f
IH2
CPU
–
–
-10 + t
10 + t
10 + t
10 + t
4 + t
1
3
3
Min.
IL
Max. CPU Clock
and V
= f
t
2
t
A
3
A
A
A
XTAL
A
Max.
1000
10
10
= 25MHz
–
–
IH2
3
3
.
Max.
t
f
OSC
–
–
–
–
–
Min.
CPU
20
V
6
6
–
–
IL
3
3
2
= f
XTAL
Max.
TCL - 10 + t
TCL - 10 + t
TCL - 10 + t
500
TCL - 16+ t
6
6
–
–
/ 2
3
3
-10 + t
Min.
1/2TCL = 1 to 25MHz
Variable CPU Clock
N = 1.5/2,/2.5/3/4/5
A
40 * N
f
Min.
10
10
CPU
A
A
A
A
–
–
3
3
= f
t
4
XTAL
100 * N
Max.
Max.
10
10
* N
–
–
–
–
–
–
–
ST10C167
3
3
Unit
ns
ns
ns
ns
ns
45/65
Unit
ns
ns
ns
ns
ns