W90P710_05 Datasheet, PDF (57/526 Pages) Winbond – 16/32-bit ARM microcontroller

W90P710
Continued.
BITS
[5]
[4]
[3:1]
[0]
UART0
ECLKS
CLKS
RESET
DESCRIPTION
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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Publication Release Date: January 17, 2005
Revision A.2