參數(shù)資料
型號(hào)： ST92163R4
英文描述： 8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS. 20K ROM. 2K RAM. I 2 C. SCI. & MFT
中文描述： 16位產(chǎn)品全速USB微控制器，16終點(diǎn)復(fù)合設(shè)備。 20,000光盤。 2K的RAM。余2長(zhǎng)脊髓損傷。
文件頁數(shù)： 82/230頁
文件大小： 2743K
代理商： ST92163R4
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ST92163 - RESET AND CLOCK CONTROL UNIT (RCCU)
CLOCK CONTROL REGISTERS
CLOCK FLAG REGISTER (CLK_FLAG)
R242 -Read/Write
Register Page: 55
Reset Value: 0100 1000 after a Watchdog Reset
Reset Value: 0010 1000 after a Software Reset
Reset Value: 0000 1000 after a Power-On Reset
7
WARNING
: If this register is accessed with a logi-
cal instruction, such as AND or OR, some bits may
not be set as expected.
WARNING:
If you select the CK_AF as system
clock and turn off the oscillator (bits R240.2 and
R242.4 at 1), and then switch back to the XT clock
by resetting the R240.2 bit, you must wait for the
oscillator to restart correctly (12ms).
Bit 7 =
EX_STP
: External Stop flag
This bit is set by hardware and cleared by soft-
ware.
0: No External Stop condition occurred
1: External Stop condition occurred
Bit 6 =
WDGRES
: Watchdog reset flag.
This bit is read only.
0: No Watchdog reset occurred
1: Watchdog reset occurred
Bit 5 =
SOFTRES
: Software Reset Flag.
This bit is read only.
0: No software reset occurred
1: Software reset occurred (HALT instruction)
Bit 4 =
XTSTOP
: External Stop Enable.
0: External stop disabled
1: The Xtal oscillator will be stopped as soon as
the CK_AF clock is present and selected,
whether this is done explicitly by the user pro-
gram, or as a result of WFI, if WFI_CKSEL has
previously been set to select the CK_AF clock
during WFI.
WARNING:
When the program writes ‘1’ to the
XTSTOP bit, it will still be read as 0 and is only set
when the CK_AF clock is running (CKAF_ST=1).
Take care, as any operation such as a subsequent
AND with `1' or an OR with `0' to the XTSTOP bit
will reset it and the oscillator will not be stopped
even if CKAF_ST is subsequently set.
Bit 3 =
XT_DIV16
:
CLOCK/16 Selection
This bit is set and cleared by software. An interrupt
is generated when the bit is toggled.
0: CLOCK2/16 is selected and the PLL is off
1: The input is CLOCK2 (or the PLL output de-
pending on the value of CSU_CKSEL)
WARNING:
After this bit is modified from 0 to 1,
take care that the PLL lock-in time has elapsed be-
fore setting the CSU_CKSEL bit.
Bit 2 =
CKAF_ST
: (Read Only)
If set, indicates that the alternate function clock
has been selected. If no CK_AF clock signal is
present on the pin, the selection will not occur. If
reset, the PLL clock, CLOCK2 or CLOCK2/16 is
selected (depending on bit 0).
Bit 1=
LOCK
:
PLL locked-in
This bit is read only.
0: The PLL is turned off or not locked and cannot
be selected as system clock source.
1: The PLL is locked
Bit 0 =
CSU_CKSEL
:
CSU Clock Select
This bit is set and cleared by software. It also
cleared by hardware when:
– bits DX[2:0] (PLLCONF) are set to 111;
– the quartz is stopped (by hardware or software);
– WFI is executed while the LPOWFI bit is set;
– the XT_DIV16 bit (CLK_FLAG) is forced to ’0’.
This prevents the PLL, when not yet locked, from
providing an irregular clock. Furthermore, a ‘0’
stored in this bit speeds up the PLL’s locking.
0: CLOCK2 provides the system clock
1: The PLL Multiplier provides the system clock.
NOTE
: Setting the CKAF_SEL bit overrides any
other clock selection. Resetting the XT_DIV16 bit
overrides the CSU_CKSEL selection
0
EX_
STP
WDG
RES
SOFT
RES
XT-
STOP
XT_
DIV16
CKAF_
ST
LOC
K
CSU_
CK-
SEL
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