Appendix F NVM Electrical Parameters
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
777
Appendix F
NVM Electrical Parameters
F.1
NVM Timing Parameters
The time base for all NVM program or erase operations is derived from the bus clock using the FCLKDIV
register. The frequency of this derived clock must be set within the limits specified as f
NVMOP
. The NVM
module does not have any means to monitor the frequency and will not prevent program or erase operation
at frequencies above or below the specified minimum. When attempting to program or erase the NVM
module at a lower frequency, a full program or erase transition is not assured.
The following sections provide equations which can be used to determine the time required to execute
specific flash commands. All timing parameters are a function of the bus clock frequency, f
NVMBUS
. All
program and erase times are also a function of the NVM operating frequency, f
NVMOP
. A summary of key
timing parameters can be found in
.
