MCF5212CAE66 查看數據表（PDF） - Freescale Semiconductor

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MCF5212CAE66

ColdFire Microcontroller

Freescale Semiconductor 

MCF5213 Family Configurations

1.2 Reset Signals

Table 4 describes signals used to reset the chip or as a reset indication.

Table 4. Reset Signals

Signal Name

Reset In

Reset Out

Abbreviation

Function

I/O

RSTI

RSTO

Primary reset input to the device. Asserting RSTI for at least 8 CPU I

clock cycles immediately resets the CPU and peripherals.

Driven low for 1024 CPU clocks after the reset source has deasserted. O

1.3 PLL and Clock Signals

Table 5 describes signals used to support the on-chip clock generation circuitry.

Table 5. PLL and Clock Signals

Signal Name

External Clock In

Crystal

Clock Out

Abbreviation

Function

I/O

EXTAL Crystal oscillator or external clock input except when the on-chip

I

relaxation oscillator is used.

XTAL

Crystal oscillator output except when CLKMOD1=1, then sampled as O

part of the clock mode selection mechanism.

CLKOUT This output signal reflects the internal system clock.

O

1.4 Mode Selection

Table 6 describes signals used in mode selection; Table 7 describes the particular clocking modes.

Table 6. Mode Selection Signals

Signal Name

Abbreviation

Function

I/O

Clock Mode Selection CLKMOD[1:0] Selects the clock boot mode.

I

Reset Configuration

RCON

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.

Test

TEST

Reserved for factory testing only and in normal modes of operation I

should be connected to VSS to prevent unintentional activation of

test functions.

CLKMOD[1:0]

00

00

01

10

10

11

Table 7. Clocking Modes

XTAL

0

1

N/A

0

1

N/A

Configure the clock mode.

PLL disabled, clock driven by external oscillator

PLL disabled, clock driven by on-chip oscillator

PLL disabled, clock driven by crystal

PLL in normal mode, clock driven by external oscillator

PLL in normal mode, clock driven by on-chip oscillator

PLL in normal mode, clock driven by crystal

MCF5213 ColdFire Microcontroller, Rev. 3

20

Freescale Semiconductor

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