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M451
May. 4, 2018
Page
564
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
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CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
1
0
Falling edge
0
1
High Level
0
0
Low level
Backup Domain GPIO Function
6.12.5.12
When PF.0/X32O and PF.1/X32I pins are not used as low speed 32K oscillator function, they can
be used as GPIO pin function. The CTLSEL (RTC_LXTOCTL[3]) is used to select the PF.0/X32O
pin is controlled by RTC or GPIO module. The PF.1/X32I and PF.2/TAMPER pins are controlled
by CTLSEL in RTC_LXTICTL[3] and RTC_TAMPCTL[3] respectively.
CTLSEL
RTC PFx_OPMODE
GPIO PFx_MODE
GPIO PFx_DOUT
RTC PFx_DOUT
Output
Buffer
PF.x
Weak Pull-up
Resistor
0
1
0
0
1
1
GPIO PFx_SMTEN
V
BAT
Pull Up
Control
Logic
Output
Enable
Control
Logic
Pin input
X= 0, 1, 2
Figure 6.12-2 Backup I/O Control Diagram
In the figure, GPIO PFx_MODE means the GPIO register PF_MODE. While, RTC PFx_OPMODE
means the RTC registers RTC_LXTOCTL[1:0] and RTC_LXTICTL[1:0]. i.e. OPMODE.
Содержание ARM Cortex NuMicro M451 Series
Страница 301: ...M451 May 4 2018 Page 301 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL...
Страница 324: ...M451 May 4 2018 Page 324 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL Figure 6 4 18 Checksum Calculation Flow...
Страница 355: ...M451 May 4 2018 Page 355 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 2 0 Reserved Reserved...
Страница 625: ...M451 May 4 2018 Page 625 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 00 5 bits 01 6 bits 10 7 bits 11 8 bits...
Страница 721: ...M451 May 4 2018 Page 721 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL the SCL line 1 0 Reserved Reserved...
Страница 1001: ...M451 May 4 2018 Page 1001 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 10x10x1 4 mm footprint 2 0 mm 9 2...
Страница 1002: ...M451 May 4 2018 Page 1002 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 7x7x1 4 mm footprint 2 0 mm 9 3...
Страница 1003: ...M451 May 4 2018 Page 1003 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 48L 7x7x1 4mm footprint 2 0mm 9 4...