56F8356 Datasheet, PDF (37/176 Pages) Motorola, Inc – 56F8356 16-bit Hybrid Controller

Signal Pins
Table 2-2 Signal and Package Information for the 144-Pin LQFP (Continued)
Signal Name Pin No. Type
State
During
Reset
Signal Description
EXTBOOT
112
Schmitt
Input
Input,
pull-up
External Boot — This input is tied to V_DD to force the device to
boot from off-chip memory (assuming that the on-chip Flash
enabled _{memory is not in a secure state). Otherwise, it is tied to ground.}
For details, see Table 4-4.
EMI_MODE
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.
143
Schmitt
Input,
External Memory Mode — The EMI_MODE input is internally tied
Input
pull-up
enabled
low (to V_SS). 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.
56F8356 Technical Data, Rev. 13
Freescale Semiconductor
37
Preliminary