MCF548x ColdFire Microprocessor, Rev. 4 Reset Timing Specifications Freescale Se" />
參數(shù)資料
型號(hào)： MCF5485CVR200
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 4/34頁(yè)
文件大?。?/td> 0K
描述： IC MPU 32BIT COLDF 388-PBGA
標(biāo)準(zhǔn)包裝： 40
系列： MCF548x
核心處理器： Coldfire V4E
芯體尺寸： 32-位
速度： 200MHz
連通性： CAN，EBI/EMI，以太網(wǎng)，I²C，SPI，UART/USART，USB
外圍設(shè)備： DMA，PWM，WDT
輸入/輸出數(shù)： 99
程序存儲(chǔ)器類型： ROMless
RAM 容量： 32K x 8
電壓 - 電源 (Vcc/Vdd)： 1.43 V ~ 1.58 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 388-BBGA
包裝： 托盤
MCF548x ColdFire Microprocessor, Rev. 4
Reset Timing Specifications
Freescale Semiconductor
12
7
Reset Timing Specifications
Table 9 lists specifications for the reset timing parameters shown in Figure 10
Figure 10 shows reset timing for the values in Table 9.
Figure 10. Reset Timing
8FlexBus
A multi-function external bus interface called FlexBus is provided on the MCF5482 with basic functionality to interface to
slave-only devices up to a maximum bus frequency of 66 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. The FlexBus interface has six
general purpose chip-selects (FBCS[5:0]). Chip-select FBCS0 can be dedicated to boot ROM access and can be programmed
to be byte (8 bits), word (16 bits), or longword (32 bits) wide. Control signal timing is compatible with common ROM / flash
memories.
Table 9. Reset Timing Specifications
Num
Characteristic
50 MHz CLKIN
Units
Min
Max
R11
1 RSTI and FlexBus data lines are synchronized internally. Setup and hold
times must be met only if recognition on a particular clock is required.
Valid to CLKIN (setup)
8
—
ns
R2
CLKIN to invalid (hold)
1.0
—
ns
R3
RSTI to invalid (hold)
1.0
—
ns
RSTI pulse duration
5
—
CLKIN cycles
CLKIN
R1
R3
R2
R1
RSTI
Mode Select
FlexBus
NOTE:
Mode selects are registered on the rising clock edge before
the cycle in which RSTI is recognized as being negated.
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