参数资料
型号: M66291GP
元件分类: 总线控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP48
封装: 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数: 4/128页
文件大小: 928K
代理商: M66291GP
M66291GP/HP
Rev 1.01 2004.11.01 page 99 of 122
3.5.3
CPU Interface Bus Width Selection
The bus width is selected by the *HWR/*BYTE pin level at the rising of the *RST pin.
The 8-bit width is selected when *HWR/*BYTE pin is “L” level and 16-bit when it is “H” level.
With the 8-bit width selected, fix the *HWR/*BYTE pin to “L”.
3.5.4
Combination of CPU Interface Input Pins
CPU
Interface
*CS
*HWR
*LWR
*RD
Valid
address
D15-8
D7-0
Remarks
L
H
A6-0
Note 1
Data input
Writes the lower byte
L
H
L
A6-0
Note 1
Data output
Reads the lower byte
8-bit
width
H
X
A6-0
Note 1
Hi-Z
L
H
A6-1
Data input
Hi-Z
Writes the upper byte
L
H
L
H
A6-1
Hi-Z
Data input
Writes the lower byte
L
H
A6-1
Data input
Writes the upper and lower bytes
L
H
L
A6-1
Data output
Data output Reads the upper and lower bytes
16-bit
width
H
X
A6-1
Hi-Z
X
: Don’t care
Hi-Z : High impedance
Note 1: The D15/A0 become input pins, while the others depend on the ports setting.
Note 2: The above figure is not applicable when accessing to the FIFO Data Register.
HW R/BYTE
RST
HW R/BYTE
RST
"L"
W hen select to 8-bit bus width
W hen select to 16-bit bus width
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