PXS20RM Datasheet, PDF (543/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Reset phase
or self-test
Normal phase
FCCU_F[0]
FCCU_F[1]
Fault Collection and Control Unit (FCCU)
Error phase
Config phase
Input
or high-Z
Output
Figure 22-40. Dual-rail protocol (slow switching mode)
Reset phase
or self-test
Normal phase
FCCU_F[0]
Error phase
FCCU_F[1]
High-Z
Config phase
Input
or high-Z
Output
Figure 22-41. Dual-rail protocol (fast switching mode)
High-Z
22.7.10.2 Time switching protocol
The encoding scheme is given in Table 22-29 and the related timing diagram is given in Figure 22-42.
Table 22-29. Time switching encoding
Logical state
non-faulty
non-faulty
faulty
reset
configuration
Time switching encoding
(output pins FCCU_F[1:0])
Note
10
01
10
high-Z
01
= non-faulty
toggling
no toggling
no toggling
when FCCU_CFG.CM = 0
when FCCU_CFG.CM = 1
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
22-43