ADuCM310 Hardware Reference Manual
UG-549
Rev. C | Page 13 of 192
Clocking Status Register
Address: 0x40028018, Reset: 0x0003, Name: CLKSTAT0
The clocking status register monitors PLL and oscillator status.
Table 8. Bit Descriptions for CLKSTAT0
Bits
Bit Name
Description
Reset
Access
15
RESERVED
Reserved. Always returns 0 when read.
0x0
R
14
HFXTALNOK
HF crystal not stable. This bit is sticky. It interrupts the core when interrupts are
enabled. Write a 1 to this location to clear it.
0x0
RW
0: HF crystal stable signal has not been deasserted.
1: HF crystal stable signal has been deasserted.
13
HFXTALOK
HF crystal stable. This bit is sticky. It interrupts the core when interrupts are
enabled. Write a 1 to this location to clear it.
0x0
RW
0: HF crystal stable signal has not been asserted.
1: HF crystal stable signal has been asserted.
12
HFXTALSTATUS
HF crystal status.
0x0
R
0: HF crystal is not stable or not enabled.
1: HF crystal is stable.
[11:3]
RESERVED
Reserved.
0x0
R
2
SPLLUNLOCK
System PLL unlock. This bit is sticky. SPLLUNLOCK is set when the PLL loses
its lock. SPLLUNLOCK is used as the interrupt source to signal the core that
a lock was lost. Writing a 1 to this bit clears it. SPLLUNLOCK does not set
again unless the system PLL gains a lock and subsequently loses it again.
0x0
RW
0: no loss of PLL lock was detected.
1: PLL loss of lock was detected.
1
SPLLLOCK
System PLL lock. This bit is sticky. SPLLLOCK is set when the PLL locks.
SPLLLOCK is used as the interrupt source to signal the core that a lock was
detected. Writing a 1 to this bit clears it. SPLLLOCK does not set again
unless the system PLL loses lock and subsequently locks again.
0x1
RW
0: no PLL lock event was detected.
1: PLL lock event was detected.
0
SPLLSTATUS
System PLL status. Indicates the current status of the PLL. Initially, the system
PLL is unlocked. After a stabilization period, the PLL locks and is ready for
use as the system clock source. This is a read only bit. A write has no effect.
0x1
R
0: the PLL is not locked or not properly configured. The PLL is not ready for
use as the system clock source.
1: the PLL is locked and is ready for use as the system clock source.