CXD5602 User Manual
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887/1010
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3.11.3.2
Clock and Reset
Figure UART-101 shows the clock and reset system diagram of the UART2.
GEAR_IMG_SPI.gear_n_spi
GEAR_IMG_WSPI.gear_m_img_wspi
GEAR_IMG_WSPI.gear_n_img_wspi
SPI4
SPI5
PCLK
SSPCLK
PCLK
SSPCLK
CK_APP
UART2
GEAR_IMG_UART.gear_m_uart
GEAR_IMG_UART.gear_n_uart
CK
GATE
N/M
GEAR_AHB.gear_m_ahb
GEAR_AHB.gear_n_ahb
CK_GATE_AHB.ck_gate_img
RESET.xrs_img
PWD_RESET0.PWD_APP
PCLK
PRESETn
UARTCLK
IMG
_R
ST
_X
nSSPRST
PRESETn
nSSPRST
PRESETn
nUARTRST
1/M
CK
GATE
1/M
CK
GATE
1/M
CK
GATE
GEAR_IMG_SPI.gear_m_spi
0
3
2
1
RCOSC
SYSPLL
XOSC
RTC_CLK_IN(32.768kHz)
0
3
2
1
0
1
1/2
1/3
1/4
1/5
APP_CKSEL.APP_PLL_DIV5
CK
GATE
APP_CKEN.APP
APP_CKSEL.STAT_APP_CLK_SEL4
APP_CKSEL.STAT_SP_CLK_SEL4
Figure UART-101
UART2 Clock and Reset System
3.11.3.3
Clock Supply Start and Stop
3.11.3.3.1
Clock Supply Start
Perform the following control to start supplying the UARTCLK clock and PCLK clock to the UART2.
1.
Reset release
PWD_RESET0.PWD_APP
=1'b1
RESET.xrs_img
=1'b1
2.
Supply the CK_APP (For details, refer to the APP Section (3.13))
3.
Clock supply for the UART2 register and division ratio setting
GEAR_AHB.gear_m_ahb
=(arbitrary: denominator setting of the division ratio)
GEAR_AHB.gear_n_ahb
=(arbitrary: numerator setting of the division ratio)
CK_GATE_AHB.ck_gate_img
=1'b1
4.
UART2 control clock supply and division ratio setting
GEAR_IMG_UART.gear_m_uart
=(arbitrary: denominator setting of the division ratio)
GEAR_IMG_UART.gear_n_uart
=1'b1
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