PXS20RM Datasheet, PDF (241/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

12.3.5 Interrupt status register (CMU_ISR)
Clock Monitor Unit (CMU)
Address: Base + 0x10
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R0 0 0 0 0 0 0 0 0 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
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
000000000000
W
w1c w1c w1c w1c
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 12-5. Interrupt status register (CMU_ISR)
Table 12-8. CMU_ISR field descriptions
Field
Description
FLCI_A
FHHI_A
FLLI_A
OLRI
Monitored clock frequency less than reference clock interrupt
This bit is set by hardware when both of the following are true:
• The monitored clock frequency becomes lower than reference clock frequency (F_{IRCOSC_CLK}4)
value
• The selected clock source is 'ON' (and locked in the case of FMPLL_0 and FMPLL_1).
It can be cleared by software by writing 1.
0 No FLC event.
1 FLC event is pending.
Monitored clock frequency higher than high reference interrupt
This bit is set by hardware when both of the following are true:
• The monitored frequency becomes higher than HFREF_A value
• The selected clock source is 'ON' (and locked in the case of FMPLL_0 and FMPLL_1).
It can be cleared by software by writing 1.
0 No FHH event.
1 FHH event is pending.
Monitored clock frequency less than low reference event
This bit is set by hardware when both of the following are true:
• The monitored clock frequency becomes lower than LFREF_A value
• The selected clock source is 'ON' (and locked in the case of FMPLL_0 and FMPLL_1).
It can be cleared by software by writing 1.
0 No FLL event.
1 FLL event is pending.
XOSC clock frequency less than IRCOSC clock frequency event
This bit is set by hardware when both of the following are true:
• The frequency of XOSC_CLK is less than IRCOSC_CLK/2^RCDIV frequency
• XOSC_CLK is ‘ON’ and stable as signaled by the MC_ME.
It can be cleared by software by writing 1.
0 No OLR event.
1 OLR event is pending.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
12-5