MAC7200 datasheet(154/976 Pages) FREESCALE

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System Configuration at Reset

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

•

Periodic Interrupt Timer (PIT)

•eMIOS (MTS)

•IIC

•FlexCAN

•

DSPI

Following a Debug Reset, the Nexus is disabled, and must be explicitly enabled. Please refer to

Section 11.1.3, “Modes of Operation” for more information.

6.7.4

I/O pins

Refer to Chapter 34, “Port Integration Module (PIM_MAC7202)” for mode dependent pin configuration

of port A, C and D out of Reset. All other pins are configured as General Purpose Inputs out after a POR

or System Reset. Debug Reset has no effect on the configuration of GPIO pins.

NOTE

All non-bonded out pins should be configured as outputs or pull-ups or

pull-downs enabled after reset in order to avoid current drawn from floating

inputs. Refer to Table 4-1 for affected pins.

6.7.5

Memories

Refer to Chapter 9, “Device Memory Map” for locations of the memories depending on the operating

mode after Reset.

The RAM array is not automatically initialized out of Reset. Because of the ECC functionality built into

the RAM, the array must be initialized using 32-bit writes. After initialization, the array may be accessed

using 8, 16 and 32-bit reads and writes.

6.8

System Configuration at Reset

The reset state of the system will be:

•

All pads on Ports A-G are placed into GPI mode, except in Expanded Mode, where all external bus

pins are placed in Primary Peripheral Mode.

— Pin A0 to A15 - DATA0 to DATA15

— Pin C0 to C15 - ADDR0 to ADDR15

— Pin D0 to D2 - BWE0, BWE1, CLKOUT

— Pin D5 to D15 - ADDR16 to ADDR21, BURST, TA, CS0, R/W

•

TDI pad is an input with pull-up enabled

•

TDO pad is an output with fastest slew rate selected

•

TCK pad is an input with pull-down enabled

•

TMS pad is an input with pull-up enabled

•RESET initially driven by the CRG, but switched to an input after the initial power-on reset setup

by the CRG. This can be thought of as an open-drain RESET pin.

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