MAC7101CVF datasheet(33/48 Pages) MOTOROLA

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MAC7100 Microcontroller Family Hardware Specifications

MOTOROLA

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Electrical Characteristics

3.12 FlexCAN Electrical Specifications

3.13 Program Flash and Data Flash Timing

Characteristics

NOTE

Unless otherwise noted the abbreviation NVM (Non-Volatile Memory) is

used for both program Flash and data Flash.

3.13.1 NVM timing

The time base for all NVM program or erase operations is derived from the system clock divided by two

(Fsys/2). A minimum system frequency fNVMfsys is required for performing program or erase operations.

The NVM modules do not have any means to monitor the frequency and will not prevent 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 and Data Flash program and erase operations are timed using a clock derived from the system

frequency using the CFMCLKD register. The frequency of this clock must be set within the limits specified

as fNVMOP. The minimum program and erase times shown in Table 36 are calculated for maximum fNVMOP

and maximum fbus. The maximum times are calculated for minimum fNVMOP and a fbus of 2 MHz.

3.13.1.1 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.

3.13.1.2 Burst Programming

This applies only to the Flash where up to 32 words in a row can be programmed consecutively using burst

programming by keeping the command pipeline filled. The time to program a consecutive word can be

calculated as:

The time to program a whole row is:

Burst programming is more than 2 times faster than single word programming.

Table 35. FlexCAN Wake-up Pulse Characteristics

Conditions are shown in Table 6 unless otherwise noted

Num C

Rating

Symbol

Min

Typ

Max

Unit

P FlexCAN Wake-up dominant pulse filtered

tWUP

——

µs

P FlexCAN Wake-up dominant pulse passed

tWUP

5—

—

µs

tswpgm

fNVMOP

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

⋅

fbus

---------

⋅

tbwpgm

fNVMOP

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

⋅

fbus

---------

⋅

tbrpgm

tswpgm 31 tbwpgm

⋅

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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