PXS20RM Datasheet, PDF (516/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Fault Collection and Control Unit (FCCU)
FCCU_CFSx register, configured as SW recoverable faults, can be cleared by the following locked
sequence:
• to write the proper key into the FCCU_CFK register
• to clear the status (flag) bit CFSx  the opcode OP11 is automatically set into the
FCCU_CTRL.OPR field
• to wait for the completion of the operation (FCCU_CTRL.OPS field)
• to read the FCCU_CFSx register in order to verify the effective deletion and in case of failure to
repeat the sequence
As result of the above sequence, in addition the FAULT interface provides support to clear the external
FAULT root.
The FCCU moves from the FAULT state into the NORMAL state if the source fault which caused the
transition into the FAULT state has been removed (HW recoverable fault) or cleared via SW (SW
recoverable fault). Concurrently the FAULT interface provides support to clear the FAULT root. In case
of nested faults that are not all recovered, the FCCU remains into the FAULT state or moves into the
ALARM state.
The SW application executes the FCCU_CFSx read operation by the following sequence:
• to set the OP9 operation into the FCCU_CTRL.OPR field
• to wait for the completion of the operation (FCCU_CTRL.OPS field)
• to read the FCCU_CFSx register
The following errors are ignored:
• to write a wrong key into the FCCU_CFK register
• to attempt to clear a HW recoverable error
Offset: 0x06C–0x078 (4 registers)
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
W w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c
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
W w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c w1c
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 22-11. FCCU CF Status Register (FCCU_CFS0..3)
NOTE
Register FCCU_CFS0 shows status of CF[0:31].
Register FCCU_CFS1 shows status of CF[37] (bit26). All other register bits
of FCCU_CFS1 are unused.
22-16
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor