TC1791 Datasheet, PDF (129/153 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1791
Electrical ParametersAC Parameters
Note: f_OSCREF has to be within the range of 2 MHz to 3 MHz and should be as close as
possible to 2.5 MHz.
The monitored frequency is too low if it is below 1.25 MHz and too high if it is above
7.5 MHz. This leads to the following two conditions:
• Too low: f_OSC < 1.25 MHz × (SCU_OSCCON.OSCVAL+1)
• Too high: f_OSC > 7.5 MHz × (SCU_OSCCON.OSCVAL+1)
Note: The accuracy is 30% for these boundaries.
Frequency Modulation
Frequency modulation defines a slow and predictable variation of the clock speed. The
modulation configuration itself is controlled via register SCU_PLLCON2 where the two
bit fields define the modulation properties.
(10)
fMOD
=
f---O----S----C--- _{× M------O-----D-----F---R-----E----Q-----×-----3---1---,---3---2--}
P
MODAMP
(11)
MA = ^M----_N--O----_×-D-----A₁---₆-M--₁----P--
Data Sheet
122
V 1.1, 2014-05