ST10R272L STMicroelectronics, ST10R272L Datasheet - Page 47

• Manufacturer Part Number: ST10R272L
• Description: 16-BIT Romless MCU WITH MAC UNIT
• Manufacturer: STMicroelectronics

Specifications of ST10R272L

• Cpu Frequency: 0 to 50 MHz
• Power: 3.3 Volt +/-0.3V

16.3.1
ST10R272L internal operation is controlled by the CPU clock f
clock can trigger internal (e.g. pipeline) or external (e.g. bus cycles) operations. The external
timing (AC Characteristics) specification therefore depends on the time between two consec-
utive edges of the CPU clock, called “TCL” (see figure below).
The CPU clock signal can be generated by different mechanisms. The duration of TCLs and
their variation (and also the external timing) depends on the f
must be considered when calculating ST10R272L timing.
The CPU clock generation mechanism is set during reset by the logic levels on pins P0.15-13
(P0H.7-5).
P0.15-13 (P0H.7-5)
1
1
1
Phase Locked Loop Operation (PLL factor=4)
Direct Clock Drive
Prescaler Operation
CPU Clock Generation Mechanisms
1
1
0
f
f
f
f
f
f
XTAL
CPU
XTAL
CPU
XTAL
CPU
1
0
1
Figure 14 CPU clock generation mechanisms
Table 15 CPU clock generation mechanisms
CPU frequency
f
F
F
F
CPU
XTAL
XTAL
XTAL
= f
* 4
* 3
* 2
XTAL
* F
ST10R272L - ELECTRICAL CHARACTERISTICS
External clock
input range 10-
50MHz
2.5 to 12.5 MHz
3.33 to 16.66 MHz
5 to 25 MHz
CPU
CPU
generation mechanism. This
TCL
Notes
Default configuration
. Both edges of the CPU
TCL
TCL TCL
TCL TCL
47/77
1