SCF5250 datasheet(21/48 Pages) MOTOROLA

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Electrical Characteristics

SCF5250 Integrated ColdFire® Microprocessor Data Sheet, Rev. 1.1

Freescale Semiconductor

4.20 BDM/JTAG Signals

The SCF5250 complies with the IEEE 1149.1A JTAG testing standard. The JTAG test pins are multiplexed

with background debug pins.

4.21 Clock and Reset signals

These signals configure the SCF5250 and provide interface signals to the external system.

4.21.1 Reset In

Asserting RSTI causes the SCF5250SCF5250 to enter reset exception processing. When RSTI is

recognized, the data bus is tri-stated.

4.21.2 Clock Input

SCF5250 includes on -chip crystal oscillator. The crystal should be connected between CRIN and CROUT.

An externally generated clock signal can also be used and should be connected directly to the CRIN pin.

4.22 Wake-Up Signal

To exit power down mode, apply a LOW level to the WAKE_UP/GPIO21 input pin.

4.23 On-chip Linear Regulator

The SCF5250 includes an on-chip linear regulator. This regulator provides an 1.2 V output which is

intended to be used to power the SCF5250 core. Three pins are associated with this function.

LININ, LINOUT and LINGND. Typically LININ would be fed by the I/O (PAD) supply (3.3 V) with

separate filtering recommended to provide some isolation between the I/O and the core.

In portable solutions this linear regulator may not be efficient enough and in this case we would expect the

1.2 V supply to be generated externally, possibly by a highly efficient DC-DC convertor.

If not used leave pins not connected.

Electrical Characteristics

Table 14. Maximum Ratings

Rating

Symbol

Value

Units

Supply Core Voltage

Vcc

-0.5 to +2.5

Maximum Core Operating Voltage

Vcc

+1.32

Minimum Core Operating Voltage

Vcc

+1.08

SCF5250 датащи(PDF) 21 Page - Motorola, Inc