ST10F273 datasheet(155/179 Pages) STMICROELECTRONICS

tên linh kiện	ST10F273

Giải thích chi tiết về linh kiện	16-bit MCU with 512 Kbyte Flash memory and 36 Kbyte RAM

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ST10F273

Electrical characteristics

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24.8.14

Memory cycle variables

The tables below use three variables which are derived from the BUSCONx registers and

represent the special characteristics of the programmed memory cycle. The following table

describes, how these variables are to be computed.

24.8.15

External memory bus timing

In next sections the external memory bus timings are reported. The given values are

computed for a maximum CPU clock of 40 MHz.

It is evident that when higher CPU clock frequency is used (up to 64 MHz), some numbers in

the timing formulas become zero or negative, that in most of the cases is not acceptable or

not meaningful at all. In these cases, it is necessary to relax the speed of the bus setting

properly tA, tC and tF.

Note:

All external memory bus timings and SSC timings reported in the following tables are

granted by design characterization and not fully tested in production.

Description

Symbol

Values

ALE extension

TCL x [ALECTL]

Memory cycle time wait states

2TCL x (15 - [MCTC])

Memory tri-state time

2TCL x (1 - [MTTC])

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