MC9328MXL datasheet(18/84 Pages) FREESCALE

18 / 84 page

MC9328MXL Advance Information, Rev. 5

Freescale Semiconductor

Specifications

Figure 4. Timing Relationship with RESET_IN

Table 11. Reset Module Timing Parameter Table

Ref

No.

Parameter

1.8V ± 0.10V

3.0V ± 0.30V

Unit

Min

Max

Min

Max

Width of input POWER_ON_RESET

note1

POR width is dependent on the 32 or 32.768 kHz crystal oscillator start-up time. Design margin should

allow for crystal tolerance, i.MX chip variations, temperature impact, and supply voltage influence.

Through the process of supplying crystals for use with CMOS oscillators, crystal manufacturers have

developed a working knowledge of start-up time of their crystals. Typically, start-up times range from

400 ms to 1.2 seconds for this type of crystal.

If an external stable clock source (already running) is used instead of a crystal, the width of POR should

be ignored in calculating timing for the start-up process.

–

note1

––

Width of internal POWER_ON_RESET

(CLK32 at 32 kHz)

300

7K to 32K-cycle stretcher for SDRAM reset

Cycles of

CLK32

14K to 32K-cycle stretcher for internal system reset

HRESERT and output reset at pin RESET_OUT

Cycles of

CLK32

Width of external hard-reset RESET_IN

–

Cycles of

CLK32

4K to 32K-cycle qualifier

Cycles of

CLK32

14 cycles @ CLK32

RESET_IN

CLK32

HCLK

HRESET

RESET_OUT

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