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7721 bảng dữ liệu(PDF) 257 Page - Renesas Technology Corp

tên linh kiện 7721
Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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7721 bảng dữ liệu(HTML) 257 Page - Renesas Technology Corp

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A-D CONVERTER
7721 Group User’s Manual
12–6
12.2 Block description
12.2.2 A-D sweep pin select register
Figure 12.2.3 shows the structure of the A-D sweep pin select register.
Fig. 12.2.3 Structure of A-D control register 1
(1)
A-D sweep pin select bits (bits 1 and 0)
These bits are used to select analog input pins in the single sweep mode or repeat sweep mode.
In the single sweep mode and repeat sweep mode, pins which are not selected as analog input pins
function as programmable I/O ports.
b7
b6
b5
b4
b3
b2
b1
b0
A-D sweep pin select register (Address 1F16)
Bit
1
0
Bit name
At reset
1
Undefined
RW
Functions
Notes 1: These bits are invalid in the one-shot and repeat modes. (They may be either “0” or
“1.”)
2: When selecting an external trigger, the AN7 pin cannot be used as an analog input pin.
3: Writing to each bit of the A-D sweep pin select register must be performed while the
A-D converter halts.
7 to 2
RW
0 0 : AN0, AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins) (Note 2)
A-D sweep pin select bits
(Valid in single sweep and repeat
sweep mode ) (Note 1)
b1 b0
1
RW
Nothing is assigned.
–



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