MC9S08QE16CLC Datasheet, PDF (131/350 Pages) Freescale Semiconductor, Inc – Low-power wireless applications, Gas, water and heater meters

Cyclic Redundancy Check (S08CRCV1)
8.1.2 Modes of Operation
This section defines the CRC operation in run, wait, and stop modes.
• Run Mode - This is the basic mode of operation.
• Wait Mode - The CRC module is operational.
• Stop 1 and 2 Modes- The CRC module is not functional in these modes and will be put into its reset
state upon recovery from stop.
• Stop 3 Mode - In this mode, the CRC module will go into a low power standby state. Any CRC
calculations in progress will stop and resume after the CPU goes into run mode.
8.1.3 Block Diagram
Figure 8-2 provides a block diagram of the CRC module
7
0
CRC Low Register (CRCL)
15 14 13 12
11 ...... 6
5
4
3
21
0
16-bit CRC Generator Circuit
15
8
CRC High Register (CRCH)
Figure 8-2. Cyclic Redundancy Check (CRC) Module Block Diagram
8.2 External Signal Description
There are no CRC signals that connect off chip.
MC9S08AC60 Series Data Sheet, Rev. 3
Freescale Semiconductor
131