ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 146

• Manufacturer Part Number: ST10F273Z4
• Description: 16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
• Manufacturer: STMicroelectronics

Specifications of ST10F273Z4

• Single Voltage Supply: 5 V ±10%

Electrical characteristics
24.8.2
146/188
Definition of internal timing
The internal operation of the ST10F273Z4 is controlled by the internal CPU clock f
edges of the CPU clock can trigger internal (for example pipeline) or external (for example
bus cycles) operations.
The specification of the external timing (AC Characteristics) therefore depends on the time
between two consecutive edges of the CPU clock, called “TCL”.
The CPU clock signal can be generated by different mechanisms. The duration of TCL and
its variation (and also the derived external timing) depends on the mechanism used to
generate f
This influence must be regarded when calculating the timings for the ST10F273Z4.
The example for PLL operation shown in
The mechanism used to generate the CPU clock is selected during reset by the logic levels
on pins P0.15-13 (P0H.7-5).
Figure 43. Generation mechanisms for the CPU clock
Phase locked loop operation
Direct clock drive
Prescaler operation
CPU
fXTAL
fCPU
fXTAL
fCPU
fXTAL
fCPU
.
Figure 43
refers to a PLL factor of 4.
TCL
TCL
TCL TCL
TCL TCL
ST10F273Z4
CPU
. Both