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MCP433X bảng dữ liệu(PDF) 57 Page - Microchip Technology

tên linh kiện MCP433X
Giải thích chi tiết về linh kiện  7/8-Bit Quad SPI Digital POT with Volatile Memory
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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MCP433X bảng dữ liệu(HTML) 57 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22242A-page 57
MCP433X/435X
7.6
Read Data
Normal and High Voltage
The Read command is a 16-bit command. The format
of the command is shown in Figure 7-4.
The first 6 bits of the Read command determine the
address and the command. The 7th clock will output
the CMDERR bit on the SDO pin. The remaining
9-clocks the device will transmit the 9 data bits (D8:D0)
of the specified address (AD3:AD0).
Figure 7-4 shows the SDI and SDO information for a
Read command.
7.6.1
SINGLE READ
The read operation requires that the CS pin be in the
active state (VILor VIHH). Typically, the CS pin will be in
the inactive state (VIH) and is driven to the active state
(VILor VIHH). The 16-bit Read command (command
byte and data byte) is then clocked in on the SCK and
SDI pins. The SDO pin starts driving data on the 7th bit
(CMDERR bit) and the addressed data comes out on
the 8th through 16th clocks. Figure 6-2 through
Figure 6-3 show possible waveforms for a single read.
FIGURE 7-4:
Read Command – SDI and SDO States.
A
D
3
A
D
2
A
D
1
A
D
0
1
1
XXXXXXXXXX
11
11111 D
8
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Valid Address/Command combination
1111110000000000 Attempted Memory Read of Reserved
Memory location
COMMAND BYTE
DATA BYTE
SDI
SDO
READ DATA



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