MCF52223 FREESCALE [Freescale Semiconductor, Inc], MCF52223 Datasheet - Page 23

• Manufacturer Part Number: MCF52223
• Description: Microcontroller Data Sheet
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1.5
Table 4
1.6
Table 5
1.7
Table 6
Freescale Semiconductor
Clock Mode Selection
Reset Configuration
External Clock In
describes signals that are used to either reset the chip or as a reset indication.
describes signals that are used to support the on-chip clock generation circuitry.
describes signals used in mode selection,
Signal Name
Signal Name
Signal Name
Reset Out
Reset Signals
PLL and Clock Signals
Mode Selection
Clock Out
Reset In
Crystal
Test
Abbreviation
Abbreviation
CLKMOD[1:0] Selects the clock boot mode.
Abbreviation
CLKOUT
MCF52223 ColdFire® Microcontroller Data Sheet, Rev. 1
RSTO
EXTAL
RSTI
XTAL
RCON
TEST
Table 6. Mode Selection Signals
Primary reset input to the device. Asserting RSTI immediately resets
the CPU and peripherals.
Driven low for 512 CPU clocks after the reset source has deasserted.
Table 5. PLL and Clock Signals
Crystal oscillator or external clock input except when the on-chip
relaxation oscillator is used.
Crystal oscillator output except when CLKMOD1=1, then sampled as
part of the clockmode selection mechanism.
This output signal reflects the internal system clock.
The Serial Flash Programming mode is entered by asserting the
RCON pin (with the TEST pin negated) as the chip comes out of
reset. During this mode, the EzPort has access to the Flash memory
which can be programmed from an external device.
Reserved for factory testing only and in normal modes of operation
should be connected to VSS to prevent unintentional activation of
test functions.
Table 4. Reset Signals
Preliminary
Table 7
describes particular clocking modes.
Function
Function
Function
MCF52223 Family Configurations
I/O
I/O
I/O
O
O
O
I
I
I
I
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