參數(shù)資料
型號(hào)： MC68SEC000FU20
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： Addendum to M68000 User Manual
中文描述： 32-BIT, 20 MHz, MICROPROCESSOR, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù)： 6/26頁
文件大?。?/td> 249K
代理商： MC68SEC000FU20
6
M68000 USER’S MANUAL ADDENDUM
MOTOROLA
8-bit mode requires two bus cycles to fetch the immediate data of the STOP instruction. After the
processor clock is disabled, it is often necessary to disable the clock to other sections of your circuit.
This can be done, but be careful that runt clocks and spurious glitches are not presented to the
MC68SEC000. A timing diagram is shown in Figure 4.
Figure 4. MC68SEC000 Clock Stop Timing for 16-Bit Data Bus
Note:
pull-up or pull-down resistor.
While the MC68SEC000 is in the low-power mode, all inputs must be driven to V
DD
or V
SS
, or have a
3.
This step is optional depending on whether your applications require the MC68SEC000 signals with
three-state capability to be placed into a high-impedance state. To place the MC68SEC000 into a
three-state condition, the proper method for arbitrating the bus (as described in
in the
M68000 User’s Manual, Rev 8
)
s
hould be completed during the fetch of the status register data
for the STOP instruction. A timing diagram with the bus arbitration sequence is shown in Figure 5.
5.2 Bus Arbitration
Figure 5. MC68SEC000 Clock Stop Timing with Bus Arbitration for 16-Bit Data Bus
Write to
Low-Power
Address
Fetch Immediate
Data of STOP
Instruction
Stop
CLK
S0 S1 S2 S3 S4 S5 S6 S7
S0 S1 S2 S3 S4 S5 S6 S7
CPU_CLK
DTACK
RW
AS
BR
BG
CLK
S0 S1 S2 S3 S4 S5 S6 S7
S0 S1 S2 S3 S4 S5 S6 S7
CPU_CLK
DTACK
RW
AS
Write to
LAddress
Fetch Immediate
DInstruction
Stop
相關(guān)PDF資料
PDF描述
MC68SEC000 Addendum to M68000 User Manual
MC68SEC000CFU10 M68000 USERS MANUAL ADDENDUM
MC68HC000 1.25V 100ppm/Degrees C, 50uA in SOT23-3 Series (Bandgap) Voltage Reference 3-SOT-23 -40 to 125
MC68EC000 Addendum to M68000 User Manual
MC68EC000D Addendum to M68000 User Manual
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68SEC000FU20B1 制造商:Rochester Electronics LLC 功能描述:8/16/32 BIT MPU, STATIC - Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
MC68SEC000FU20R2 制造商:Rochester Electronics LLC 功能描述:8/16/32 BIT MPU, STATIC - Bulk 制造商:Freescale Semiconductor 功能描述:
MC68SEC000PB16 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68SEC000PB20 制造商:Rochester Electronics LLC 功能描述:8/16/32 BIT MPU, STATIC - Bulk 制造商:Motorola Inc 功能描述:
MC68SECCFU20B1 制造商:Freescale Semiconductor 功能描述: 制造商:Motorola Inc 功能描述:
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