st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 147

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

ST10F269
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)
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 68 : Generation Mechanisms for the CPU Clock
Phase locked loop operation
Direct Clock Drive
Prescaler Operation
f
f
f
f
f
f
XTAL
CPU
XTAL
CPU
XTAL
CPU
depends on the mechanism used to generate
f
This influence must be regarded when calculating
the timings for the ST10F269.
The example for PLL operation shown in
Figure 68 refers to a PLL factor of 4.
CPU
.
TCL
TCL
TCL TCL
TCL TCL
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