MM912F634CV2AP datasheet(25/335 Pages) FREESCALE

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Electrical Characteristics

Dynamic Electrical Characteristics

MM912F634

Freescale Semiconductor

3.6.2

Dynamic Electrical Characteristics MCU Die

3.6.2.1

NVM Timing

The time base for all NVM program or erase operations is derived from the bus block. A minimum bus frequency fNVMBUS is

required for performing program or erase operations. The NVM module do not has any means to monitor the frequency and will

not prevent a program or erase operation at frequencies above or below the specified minimum. Attempting to program or erase

the NVM modules at a lower frequency, a full program, or erase transition is not assured.

The Flash program and erase operations are timed using a clock derived from the bus clock using the FCLKDIV and register.

The frequency of this clock must be set within the limits specified as fNVMOP.

The minimum program and erase times shown in Table 37 are calculated for maximum fNVMOP and maximum fBUS. The

maximum times are calculated for minimum fNVMOP and a fBUS of 2.0 MHz.

3.6.2.1.1

Single Word Programming

The programming time for single word programming is dependant on the bus frequency as a well as on the frequency fNVMOP,

and can be calculated according to the following formula.

Table 35. Dynamic Electrical Characteristics - General Purpose I/O - PTB[0…2]

Ratings

Symbol

Min

Typ

Max

Unit

GPIO Digital Frequency(28)

fPTB

MHz

Propagation Delay - Rising Edge(28), (29)

tPDR

Rise Time - Rising Edge(28)

tRISE

17.5

Propagation Delay - Falling Edge(28)

tPDF

Rise Time - Falling Edge(28)

tFALL

17.5

Note:

28. Guaranteed by design.

29. Load PTBx = 100 pF.

Table 36. Dynamic Electrical Characteristics - Analog Digital Converter - ADC

Ratings

Symbol

Min

Typ

Max

Unit

ADC Operating Frequency(30)

fADC

1.6

2.0

2.4

MHz

Conversion Time (from ACCR write to CC Flag)(30)

tCONV

clk

Sample Frequency Channel 14 (Bandgap)(30)

fCH14

2.5

kHz

Note:

30. Guaranteed by design.

swpgm

NVMOP

-------------------------

⋅

bus

-----------

⋅

MM912F634CV2AP Datasheet(PDF) 25 Page - Freescale Semiconductor, Inc

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