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M451
May. 4, 2018
Page
305
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
E
CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
CONFIG0 (Address = 0x0030_0000)
31
30
29
28
27
26
25
24
CWDTEN[2]
CWDTPDEN
Reserved
CFGXT1
CFOSC
Reserved
23
22
21
20
19
18
17
16
CBODEN
CBOV
CBORST
Reserved
15
14
13
12
11
10
9
8
Reserved
CIOINI
Reserved
7
6
5
4
3
2
1
0
CBS
Reserved
CWDTEN[1:0]
Reserved
LOCK
DFEN
Bits
Descriptions
[31]
CWDTEN[2]
Watchdog Timer Hardware Enable Bit
When watchdog timer hardware enable function is enabled, the watchdog enable bit
WDTEN (WDT_CTL[7]) and watchdog reset enable bit RSTEN (WDT_CTL[1]) is set to 1
automatically after power on. The clock source of watchdog timer is force at LIRC and
LIRC can’t be disabled.
CWDTEN[2:0]
is CONFIG0[31][4][3],
011 = WDT hardware enable function is active. WDT clock is always on except chip enters
Power- down mode. When chip enter Power-down mode, WDT clock is always on if
CWDTPDEN is 0 or WDT clock is controlled by LIRCEN (CLK_PWRCTL[3]) if
CWDTPDEN is 1. Please refer to bit field description of CWDTPDEN.
111 = WDT hardware enable function is inactive.
Others = WDT hardware enable function is active. WDT clock is always on.
[30]
CWDTPDEN
Watchdog Clock Power-down Enable Bit
0 = Watchdog Timer clock kept enabled when chip enters Power-down.
1 = Watchdog Timer clock is controlled by LIRCEN (CLK_PWRCTL[3]) when chip enters
Power-down.
Note:
This bit only works if CWDTEN[2:0] is set to 011
[29:28]
Reserved
Reserved.
[27]
CFGXT1
PF[4:3] Multi-Function Select
0 = PF[4:3] pins are configured as GPIO pins.
1 =PF[4:3] pins are configured as external
4~20 MHz external high speed crystal oscillator
(HXT) pins.
[26]
CFOSC
CPU Clock Source Selection After Reset
The value of CFOSC will be loaded to HCLK (CLK_CLKSEL0[2:0]) in system clock
controller after any reset occurs. HCLK[2:0] = 111 if CFOSC = 1, HCLK[2:0] = 000 if
CFGSC=0.
0 = 4~20 MHz external high speed crystal oscillator (HXT)
1 = 22.1184 MHz internal high speed RC oscillator (HIRC)
[25:24]
Reserved
Reserved.
[23]
CBODEN
Brown-Out Detector Enable Bit
0= Brown-out detect Enabled after powered on.
1= Brown-out detect Disabled after powered on.
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...