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Table 5-2. Module clocks (continued)
Module Bus interface clock Internal clocks I/O interface clocks
RTC Flash clock EXTAL32 —
Communication interfaces
USB FS OTG System clock USB FS clock —
USB DCD Bus clock — —
FlexCAN Bus clock OSCERCLK —
DSPI Bus clock — DSPI_SCK
I
2
C Bus clock — I2C_SCL
UART0, UART1 System clock — —
UART2-4 Bus clock — —
I
2
S Bus clock I
2
S master clock I2S_TX_BCLK,
I2S_RX_BCLK
Human-machine interfaces
GPIO System clock — —
TSI Flash clock LPO, ERCLK32K,
MCGIRCLK
—
5.7.1 PMC 1-kHz LPO clock
The Power Management Controller (PMC) generates a 1-kHz clock that is enabled in all
modes of operation, including all low power modes. This 1-kHz source is commonly
referred to as LPO clock or 1-kHz LPO clock.
5.7.2 WDOG clocking
The WDOG may be clocked from two clock sources as shown in the following figure.
WDOG_STCTRLH[CLKSRC]
WDOG clock
Bus clock
LPO
Figure 5-2. WDOG clock generation
Module clocks
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
170
Preliminary
Freescale Semiconductor, Inc.
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