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Table 5-1. Peripheral Clocks (continued)
Source Module
Module Reset
Bus Interface
Clock
Bus Interface
Clock Gating
Control
Peripheral
Functional Clock
PCCn Functional
Clock Divider
TPM
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
LPIT
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
Low-Power Timer
(LPTMR)
POR/LVD
DIVSLOW_CLK
Yes
LPO, ERCLK
SIRC,
OSC32KCLK
Real-time Clock
(RTC)
POR
DIVSLOW_CLK
Yes
OSC32KCLK, LPO
TSTMR
Chip Reset
DIVSLOW_CLK
SIRCLK @ 1 MHz
Communications
USB
Chip Reset
DIVCORE_CLK
Yes
SCG DIV1,
USB_CLKIN
3-bit Divide, 1-bit
Fraction
LPSPI
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
LPI2C
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
LPUART
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
EMVSIM
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
FlexIO
Chip Reset
DIVSLOW_CLK
Yes
SCG DIV3
GPIO controller
Chip Reset
DIVCORE_CLK
1. Watchdog clock sources are selected by WDOGx_CS[CLK]
2. ERCLK is either from an external pin or from the SCG Internal OSC (SOSC) and configured with the
SCG_SOSCCFG[EREFS] bit.
3. LPTMR clock sources are selected by LPTMR_PSR[PCS]
4. RTC clock sources are selected by RTC_CR[LPOS]
5. For the USB FS OTG controller to operate, the minimum required DIVCORE_CLK is 24 MHz (half of USB functional clock)
6. An additional external clock USB_CLKIN, can also selected via PCCUSB0FS, and device's PORTx MUX field
7. Additional 3bit Divide field and 1-bit Fractional field reside in PCCUSB0FS register
5.5 DIV3 Peripheral Clocking
For K32 L2A some timer peripherals and serial communication peripherals make use of
the peripheral functional clocks using the xxDIV3 clock trees.
The example below shows the main peripheral interface clock come from the
DIVSLOW_CLK output. The PCC can then choose one of four optional peripheral
functional clocks from the existing four clock sources within the SCG. The PCC can also
provide inputs for clock sources external to the SCG.
DIV3 Peripheral Clocking
K32 L2A Reference Manual, Rev. 2, 01/2020
114
NXP Semiconductors
Содержание K32 L2A Series
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