mcf5274l Freescale Semiconductor, Inc, mcf5274l Datasheet - Page 23

• Manufacturer Part Number: mcf5274l
• Description: Mcf5275 Integrated Microprocessor Family Hardware
• Manufacturer: Freescale Semiconductor, Inc

4.3
Table 5
4.4
These signals are used for doing transactions on the external bus.
Table 6
Freescale Semiconductor
Address Bus
Data Bus
External Clock In
Crystal
Clock Out
Clock Mode Selection
Reset Configuration
describes signals used in mode selection.
describes signals that are used for doing transactions on the external bus.
Signal Name
Signal Name
Signal Name
Mode Selection
External Memory Interface Signals
MCF5275 Integrated Microprocessor Family Hardware Specification, Rev. 1.1
A[23:0]
D[31:16]
Abbreviation
EXTAL
XTAL
CLKOUT
Abbreviation
CLKMOD[1:0] Configure the clock mode after reset.
RCON
Abbreviation
Table 6. External Memory Interface Signals
Table 5. Mode Selection Signals
Table 4. PLL and Clock Signals
The 24 dedicated address signals define the address of external byte,
word, and longword accesses. These three-state outputs are the 24
lsbs of the internal 32-bit address bus and multiplexed with the
SDRAM controller row and column addresses.
These three-state bidirectional signals provide the general purpose
data path between the processor and all other devices.
Always driven by an external clock input except when used as a
connection to the external crystal when the internal oscillator circuit is
used. The clock source is configured during reset by CLKMOD[1:0].
Used as a connection to the external crystal when the internal
oscillator circuit is used to drive the crystal.
This output signal reflects the internal system clock.
Indicates whether the external D[31:16] pin states affect chip
configuration at reset.
Preliminary
Function
Function
Function
Signal Descriptions
I/O
I/O
I/O
I/O
O
O
O
I
I
I
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