ST10F276Z5 STMicroelectronics, ST10F276Z5 Datasheet - Page 197

• Manufacturer Part Number: ST10F276Z5
• Description: 16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
• Manufacturer: STMicroelectronics

Specifications of ST10F276Z5

• Single Voltage Supply: 5V ±10% (embedded regulator for 1.8 V core supply)

ST10F276Z5
23.8.2
Definition of internal timing
The internal operation of the ST10F276Z5 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 ST10F276Z5.
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 52. Generation mechanisms for the CPU clock
CPU
Phase locked loop operation
Direct clock drive
Prescaler operation
.
f
f
f
f
f
f
XTAL
CPU
XTAL
CPU
XTAL
CPU
Figure 52
refers to a PLL factor of 4.
TCL
Electrical characteristics
TCL
TCL TCL
TCL TCL
CPU
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