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Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
108
Freescale Semiconductor
After system reset, the oscillator is put into powerdown state, and software has to switch on when required.
Whenever the crystal oscillator is switched on from the off state, the OSCCNT counter starts. When it
reaches the value EOCV[7:0] × 512, the oscillator clock is made available to the system. Also, an interrupt
pending FXOSC_CTL[I_OSC] bit is set. An interrupt is generated if the interrupt mask bit M_OSC is set.
The oscillator circuit can be bypassed by setting FXOSC_CTL[OSCBYP]. This bit can only be set by
software. A system reset is needed to reset this bit. In this bypass mode, the output clock has the same
polarity as the external clock applied on the EXTAL pin and the oscillator status is forced to 1. The bypass
configuration is independent of the powerdown mode of the oscillator.
shows the truth table of different oscillator configurations.
The FXOSC clock can be further divided by a configurable factor in the range 1 to 32 to generate the
divided clock to match system requirements. This division factor is specified by FXOSC_CTL[OSCDIV]
field.
6.3.3
Register description
Table 6-2. Truth table of crystal oscillator
ME_xxx_MC[FXOSCON]
FXOSC_CTL[OSCBYP]
XTAL
EXTAL
FXOSC
Oscillator mode
0
0
No crystal,
High Z
No crystal,
High Z
0
Power down,
IDDQ
x
1
x
Ext clock
EXTAL
Bypass,
OSC disabled
1
0
Crystal
Crystal
EXTAL
Normal,
OSC enabled
Gnd
Ext clock
EXTAL
Normal,
OSC enabled
Address: 0xC3FE_0000
Access: Special read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
OSCBYP
1
0
0
0
0
0
0
0
EOCV
W
RESET:
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
M_
OS
C
0
0
OSCDIV
I_
OSC
2
0
0
0
0
0
0
0
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-2. Fast External Crystal Oscillator Control Register (FXOSC_CTL)
Содержание MPC5605BK
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