M52277EVB Freescale Semiconductor, M52277EVB Datasheet - Page 21

• Manufacturer Part Number: M52277EVB
• Description: BOARD DEMO FOR MCF5227
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®r
• Type: MCUr

Specifications of M52277EVB

• Contents: Board
• Silicon Manufacturer: Freescale
• Core Architecture: Coldfire
• Core Sub-architecture: Coldfire V2
• Silicon Core Number: MCF52
• Silicon Family Name: MCF5227x
• Peak Reflow Compatible (260 C): Yes
• Rohs Compliant: Yes
• For Use With/related Products: MCF52277
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.7
5.7.1
A multi-function external bus interface called FlexBus is provided with basic functionality to interface to slave-only devices up
to a maximum bus frequency of 66MHz. It can be directly connected to asynchronous or synchronous devices 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, FB_CLK. The FB_CLK frequency may be the same as the internal system bus frequency or an integer divider
of that frequency.
The following timing numbers indicate when data will be latched or driven onto the external bus, relative to the Flexbus output
clock, FB_CLK. All other timing relationships can be derived from these values.
Freescale Semiconductor
1
Conversion Time
Sample Time
Multiplexer Settling Time
Zero-scale Error
Full-scale Error
Input Capacitance
Num
FB1
FB2
FB3
A least significant bit (lsb) is a unit of voltage equal to the smallest resolution of the ADC. This unit of measure approximately
relates the error voltage to the observed error in conversion (code error), and is useful for systemic errors such as differential
non-linearity. A 2.56-V input on an ADC with ± 3 lsb of error could read between 0x1FD and 0x203. This unit is by far the most
common terminology and will be the preferred unit used for error representation.
A bit is a unit equal to the log (base2) of the error voltage normalized to the resolution of the ADC. An error of N bits
corresponds to 2
Frequency of Operation
Clock Period (FB_CLK)
Address, Data, and Control Output Valid (FB_A[23:0], FB_D[31:0],
FB_CS[5:0], FB_R/W, FB_TS, FB_BE/BWE[3:0] and FB_OE)
Address, Data, and Control Output Hold (FB_A[23:0], FB_D[31:0],
FB_CS[5:0], FB_R/W, FB_TS, FB_BE/BWE[3:0], and FB_OE)
External Interface Timing Specifications
FlexBus
N
lsb of error. This measure is easily confused with lsb and is hard to extrapolate between integer values.
Characteristic
Table 12. ASP Electrical Characteristics (continued)
MCF5227x ColdFire
Characteristic
Table 13. FlexBus AC Timing Specifications
®
Microprocessor Data Sheet, Rev. 8
Symbol
t
t
C
t
AMS
ADC
ADS
FE
ZE
AIN
t
t
Symbol
FBCHDCV
FBCHDCI
Min
t
FBCK
15
—
—
—
—
3
12.0
Typical
Min
—
—
±320
1
—
—
—
±4
—
Electrical Characteristics
83.33
Max
7.0
—
—
±370
Max
±12
32
20
34
3
MHz
Unit
ns
ns
ns
cycles
cycles
cycles
Unit
lsb
lsb
t
t
t
pF
AIC
AIC
AIC
Notes
f
sys/2
1
1
t
1, 2
cyc
1
21