MPC5125 datasheet(45/94 Pages) FREESCALE

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Electrical and Thermal Characteristics

MPC5125 Microcontroller Data Sheet, Rev. 4

Freescale Semiconductor

•

The system PLL (SYS_PLL) takes an external reference frequency and generates the internal system clock. The

system clock frequency is determined by the external reference frequency and the settings of the SYS_PLL

configuration.

•

The e300 core PLL (CORE_PLL) generates a master clock for all of the CPU circuitry. The e300 core clock frequency

is determined by the system clock frequency and the settings of the CORE_PLL configuration.

4.2.1

System Oscillator Electrical Characteristics

The system oscillator can work in oscillator mode or in bypass mode to support an external input clock as clock reference.

Figure 4. Timing Diagram — SYS_XTAL_IN

4.2.2

RTC Oscillator Electrical Characteristics

Table 12. System Oscillator Electrical Characteristics

Characteristic

Sym

Min

Typical

Max

Unit

SpecID

SYS_XTAL frequency

fsys_xtal

15.6

33.3

35.0

MHz

O1.1

Table 13. SYS_XTAL_IN Timing

Sym

Description

Min

Max

Units

SpecID

tCYCLE

SYS_XTALI cycle time1,2

NOTES:

1 The SYS_XTALI frequency and system PLL settings must be chosen such that the resulting system frequencies do not exceed

their respective maximum or minimum operating frequencies. See the MPC5125 Reference Manual (MPC5125RM).

2 The min/max cycle times are calculated using 1/f

sys_xtal (MIN/MAX) where the fsys_xtal (MIN/MAX) (15.6 / 35 MHz) are taken from

Table 12 (system oscillator electrical characteristics).

64.1

28.57

O.1.2

tRISE

SYS_XTALI rise time3

3 Rise time is measured from 20% of VDD to 80% of VDD.

O.1.3

tFALL

SYS_XTALI fall time4

4 Fall time is measured from 20% of VDD to 80% of VDD.

O.1.4

tDUTY

SYS_XTALI duty cycle (measured at VM)

5 SYS_XTALI duty cycle is measured at V

O.1.5

Table 14. RTC Oscillator Electrical Characteristics

Characteristic

Sym

Min

Typical

Max

Unit

SpecID

RTC_XTAL frequency

frtc_xtal

—

32.768

—

kHz

O2.1

tFALL

tRISE

tCYCLE

SYS_XTAL_I CLK

tDUTY

CVIH

CVIL

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