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参数资料
| 型号： | MCF51MM128CMB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 50.33 MHz, MICROCONTROLLER, PBGA81 |
| 封装： | 10 X 10 MM, ROHS COMPLIANT, MAPBGA-81 |
| 文件页数： | 33/58页 |
| 文件大小： | 609K |
| 代理商： | MCF51MM128CMB |
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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, 25
C or is typical recommended value.
2
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.
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
Freescale reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
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