W90N745CD Datasheet, PDF (53/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
Continued.
BITS
[7]
[6]
[5]
[4]
[3:1]
[0]
USBH
TIMER
UART0
ECLKS
CLKS
RESET
DESCRIPTION
USB host clock enable bit
0 = Disable USB host controller clock
1 = Enable USB host controller clock
Timer clock enable bit
0 = Disable timer clock
1 = Enable timer clock
UART0 controller clock enable bit
0 = Disable UART0 controller clock
1 = Enable UART0 controller clock
External clock select
0 = External clock from EXTAL pin is used as system clock
1 = PLL output clock is used as system clock
After power on reset, the content of ECLKS is the Power-On
Setting value. You can program this bit to change the system clock
source.
PLL output clock select
CLKS [3:1]
System clock
0
0
0
58.594 KHz*
0
0
1
24 MHz
0
1
0
48 MHz
0
1
1
60 MHz
1
0
0
80 MHz
1
0
1
RESERVED
1
1
0
RESERVED
1
1
1
RESERVED
Note:
1. This values are based on PLL output(FOUT) is 480MHz.
2. When 24Mhz ~ 80MHz is selected, the ECLKS bit must be set to
1.
3. About 58.594KHz setting, two steps are needed. First, clear
ECLKS bit, and then clear CLKS.
Software Reset bit
This is a software reset control bit. Set logic 1 to generate an
internal reset pulse. This bit is auto-clear to logic 0 at the end of
the reset pulse.
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