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AN2021 数据表(PDF) 25 Page - STMicroelectronics

部件名 AN2021
功能描述  The ST10F272B and ST10F272E are members of the STMicroelectronics
PDF  39 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2021 数据表(HTML) 25 Page - STMicroelectronics

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AN2021
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2.4
Additional ports input control
The possibility to select between TTL and CMOS-like input thresholds has been extended to
Ports 0, 1 and 5 via the XPICON register.
2.4.1
Hardware impact
None.
2.4.2
Software impact
None.
ST10F272: XPICON (EB26h)
XREG
Reset value: --00h
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
P5
HIN
P5
LIN
P1
HIN
P1
LIN
P0
HIN
P0
LIN
-
R/W
R/W
R/W
R/W
R/W
R/W
Table 14.
XPICON register description
Bit
Function
Reset value
PxLIN
Port x Low Byte Input Level Selection
0: Pins Px.7..0 switch on standard TTL input levels
1: Pins Px.7..0 switch on CMOS input levels
0
PxHIN
Port x High Byte Input Level Selection
0: Pins Px.15..8 switch on standard TTL input levels
1: Pins Px.15..8 switch on CMOS input levels
0



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