TWR-MCF51CN Freescale Semiconductor, TWR-MCF51CN Datasheet - Page 23

• Manufacturer Part Number: TWR-MCF51CN
• Description: KIT TOWER BOARD
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®, Flexis™r
• Type: MCUr

Specifications of TWR-MCF51CN

• Contents: Board
• Product: Microcontroller Modules
• Data Bus Width: 8 bit, 16 bit, 32 bit
• Core Processor: MCF51CN128
• Operating Supply Voltage: 1.8 V to 3.6 V
• Silicon Manufacturer: Freescale
• Core Architecture: Coldfire
• Core Sub-architecture: Coldfire V1
• Silicon Core Number: MCF51
• Silicon Family Name: MCF51CN
• Rohs Compliant: Yes
• For Use With/related Products: Freescale Tower System, MCF51CN128
• For Use With: TWR-ELEV - TOWER ELEVATOR BOARDS HARDWARE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.10
A multi-function external bus interface called Mini-FlexBus is provided with basic functionality to interface to slave-only
devices up to a maximum bus frequency of
such as external boot ROMs, flash memories, gate-array logic, or other simple target (slave) devices with little or no additional
circuitry. For asynchronous devices a simple chip-select based interface can be used.
All processor bus timings are synchronous; that is, input setup/hold and output delay are given in respect to the rising edge of
a reference clock, MB_CLK. The MB_CLK frequency is half the internal system bus frequency.
The following timing numbers indicate when data is latched or driven onto the external bus, relative to the Mini-FlexBus output
clock (MB_CLK). All other timing relationships can be derived from these values.
Freescale Semiconductor
1
2
Num
MB1
MB2
MB3
MB4
MB5
Specification is valid for all MB_A[19:0], MB_D[7:0], MB_CS[1:0], MB_OE, MB_R/W, and MB_ALE.
Specification is valid for all MB_D[7:0].
—
Mini-FlexBus Timing Specifications
8-bit Non-Mux’d Bus
16-bit Mux’d Bus
—
C
D
D
D
P
P
Frequency of Operation
Clock Period
Output Valid
Output Hold
Input Setup
Input Hold
MCF51CN128 ColdFire Microcontroller Data Sheet, Rev. 4
FB_CSn, FB_OE
Table 12. Mini-FlexBus AC Timing Specifications
FB_AD[19:16]
FB_A[19:16]
FB_AD[15:0]
FB_D[7:0]
Figure 13. Mini-FlexBus Read Timing
FB_CLK
FB_R/W
FB_ALE
Characteristic
25.1666 MHz
ADDR[31:24]
. It can be directly connected to asynchronous or synchronous devices
S0
MB1
ADDR[15:0]
MB2
ADDR[19:0]
ADDR[19:16]
S1
DATA[15:0]
DATA[7:0]
39.73
Min
1.0
S2
MB4
22
10
—
—
MB5
25.1666
Max
20
—
—
—
—
MB3
S3
Electrical Characteristics
MHz
Unit
ns
ns
ns
ns
ns
S0
Notes
—
—
1
1
2
2
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