56F8346 datasheet(39/178 Pages) FREESCALE

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Signal Pins

56F8346 Technical Data, Rev. 15

Freescale Semiconductor

Preliminary

EXTBOOT

112

Schmitt

Input

Input,

pull-up

enabled

External Boot — This input is tied to VDD to force the device to

boot from off-chip memory (assuming that the on-chip Flash

memory is not in a secure state). Otherwise, it is tied to ground. For

details, see Table 4-4.

Note: When this pin is tied low, the customer boot software should

disable the internal pull-up resistor by setting the XBOOT bit of the

SIM_PUDR; see Part 6.5.6.

EMI_MODE

143

Schmitt

Input

Input,

pull-up

enabled

External Memory Mode — The EMI_MODE input is internally tied

low (to VSS). This device will boot from internal flash memory

under normal operation. This function is also affected by

EXTBOOT and the Flash security mode. For details, see

Table 4-4.

If a 20-bit address bus is not desired, then this pin is tied to ground.

Note: When this pin is tied low, the customer boot software should

disable the internal pull-up resistor by setting the EMI_MODE bit of

the SIM_PUDR; see Part 6.5.6.

Table 2-2 Signal and Package Information for the 144 Pin LQFP

Signal Name

Pin No.

Type

State

During

Reset

Signal Description

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