TWR-MCF51MM Freescale Semiconductor, TWR-MCF51MM Datasheet - Page 39

• Manufacturer Part Number: TWR-MCF51MM
• Description: TOWER SYSTEM BOARD MCF51MM
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®, Flexis™r
• Type: MCUr

Specifications of TWR-MCF51MM

• Contents: Board, 3 Modules, MED-EKG Kit, Cables, Documentation, DVD
• Product: Microcontroller Modules
• Data Bus Width: 32 bit
• Core Processor: MCF51MM
• Clock Speed: 32 KHz
• Interface Type: RS232, RS485, CAN , USB
• Flash: 256 KB
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Freescale
• Core Architecture: Coldfire
• Core Sub-architecture: Coldfire V1
• Silicon Core Number: MCF51
• Silicon Family Name: Flexis - MCF51MM
• Rohs Compliant: Yes
• For Use With/related Products: Freescale Tower System, MCF51MM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1
2
3
4
5
3.11
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
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, 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
#
6
Data in Typical column was characterized at 3.0 V, 25C or is typical recommended value.
When MCG is configured for FEE or FBE mode, input clock source must be divisible using RDIV to within the range of 31.25 kHz to 39.0625 kHz.
When MCG is configured for PEE or PBE mode, input clock source must be divisible using RDIV to within the range of 1 MHz to 2 MHz.
This parameter is characterized and not tested on each device. Proper PC board layout porcedures must be followed to achieve specifications.
4 MHz crystal.
o
Freescale reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
Crystal start-up time
Mini-FlexBus Timing Specifications
Table 19. XOSC (Temperature Range = –40 to 105
4
Characteristic
C
• Low range, low gain (RANGE =
• Low range, high gain
• High range, low gain
• High range, high gain
1
0, HGO = 0)
(RANGE = 0, HGO = 1)
(RANGE = 1, HGO = 0)
(RANGE = 1, HGO = 1)
EXTAL
Crystal or Resonator
MCU
R
F
5
5
t
t
t
Symbol
t
CSTL-HG
CSTH-HG
CSTL-LP
CSTH-LP
O
O
XTAL
°
C Ambient) (continued)
25.1666 MHz
R
C
S
2
Min
—
—
—
—
. It can be directly connected
Typ
200
400
15
5
1
Electrical Characteristics
Max
—
—
—
—
Unit
ms
C
D
D
D
D
39