MC9328MX1/D ETC, MC9328MX1/D Datasheet - Page 21

• Manufacturer Part Number: MC9328MX1/D
• Description: i.MX Integrated Portable System Processor
• Manufacturer: ETC

Freescale Semiconductor
Ref
No.
RESET_OUT
1
2
3
4
5
6
1.
RESET_IN
HRESET
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.
CLK32
HCLK
Width of input POWER_ON_RESET
Width of internal POWER_ON_RESET
(9600 *CLK32 at 32 KHz)
7K to 32K-cycle stretcher for SDRAM reset
14K to 32K-cycle stretcher for internal system reset
HRESERT and output reset at pin RESET_OUT
Width of external hard-reset RESET_IN
4K to 32K-cycle qualifier
6
Table 12. Reset Module Timing Parameter Table
Figure 4. Timing Relationship with RESET_IN
Parameter
MC9328MX1 Advance Information, Rev. 4
5
note
1.8V +/- 0.10V
Min
300
14
7
4
4
1
Max
300
14
–
7
–
4
note
3.0V +/- 0.30V
14 cycles @ CLK32
Min
300
14
7
4
4
1
4
Max
300
14
–
7
–
4
Cycles of
Cycles of
Cycles of
Cycles of
Specifications
CLK32
CLK32
CLK32
CLK32
Unit
ms
–
21