參數(shù)資料
型號(hào)： TWR-MCF51MM-KIT
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 33/57頁(yè)
文件大?。?/td> 0K
描述： KIT TOWER DEV FOR MCF51AG
設(shè)計(jì)資源： TWR-MCF51MM Schematic
標(biāo)準(zhǔn)包裝： 1
系列： ColdFire®, Flexis™
類型： MCU
適用于相關(guān)產(chǎn)品： Freescale 電源塔系統(tǒng)，MCF51MM
所含物品： 4 個(gè)板，線纜，文檔，DVD，MED-EKG 傳感器
Electrical Characteristics
Freescale Semiconductor
39
o
3.11 Mini-FlexBus Timing Specifications
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 25.1666 MHz. 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, 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.
6 Crystal start-up time 4
Low range, low gain (RANGE =
0, HGO = 0)
t
CSTL-LP
—
200
—
ms
D
Low range, high gain
(RANGE = 0, HGO = 1)
t
CSTL-HG
O
—400
—
D
High range, low gain
(RANGE = 1, HGO = 0)5
tCSTH-LP
—5
—
D
High range, high gain
(RANGE = 1, HGO = 1)5
tCSTH-HG
O
—15
—
D
1 Data in Typical column was characterized at 3.0 V, 25C or is typical recommended value.
2 When MCG is configured for FEE or FBE mode, input clock source must bedivisible using RDIV to within the range of 31.25 kHz to 39.0625 kHz.
3 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.
4 This parameter is characterized and not tested on each device. Proper PC board layout porcedures must be followed to achieve specifications.
5 4 MHz crystal.
Table 19. XOSC (Temperature Range = –40 to 105°C Ambient) (continued)
#
Characteristic
Symbol
Min
Typ1
Max
Unit
C
MCU
EXTAL
XTAL
RS
C2
Crystal or Resonator
RF
C1
MCF51MM256/128, Rev. 5
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