參數(shù)資料
型號: C8051F2XX
廠商: Electronic Theatre Controls, Inc.
英文描述: Mixed Signal 8 kB ISP Flash MCU Family
中文描述: 混合信號8 KB的閃存MCU系列的ISP
文件頁數(shù): 50/146頁
文件大?。?/td> 1856K
代理商: C8051F2XX
C8051F2xx
50
Rev. 1.6
7.
Voltage Reference (C8051F206/220/221/226)
The voltage reference circuit selects between an externally connected reference and the power supply
voltage (V
DD
). (See Figure 7.1).
An external reference can be connected to the VREF pin and selected by setting the REF0CN special
function register per Figure 7.1. The external reference supply must be between V
DD
– 0.3 V and 1 V. V
DD
may also be selected using REF0CN per SFR Definition 7.1. The electrical specifications for the Voltage
Reference are given in Table 7.1.
Figure 7.1. Voltage Reference Functional Block Diagram
SFR Definition 7.1. REF0CN: Reference Control
Vdd
Vref (external)
To ADC Ref
REF0CN[1:0]
2
Set REF0CN to:
00: Use external Vref
11: Use Vdd
Bits7–2:
UNUSED. Read = 00000b; Write = don't care
Bit1–0:
REFSL1– REFSL0: Voltage reference selection.
Bits control which reference is selected.
00: External VREF source is selected.
01: Reserved.
10: Reserved.
11: V
DD
selected as VREF source.
R/W
-
Bit7
R/W
-
Bit6
R/W
-
Bit5
R/W
-
Bit4
R/W
-
Bit3
R/W
-
Bit2
R/W
R/W
Reset Value
REFSL1
Bit1
REFSL0
Bit0
00000000
SFR Address:
0xD1
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