Data Sheet
Table Of Contents
EnzyTek Technology, Inc.
7F, No. 35, Hsueh Fu Rd., Hsinchu 300,
Taiwan , R.O.C.
TEL：886-3-573-6708 FAX： 886-3-573-8749
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EnzyTek
EnzyTek Technology, Inc.
Bootstrap signals
Bootstrap Mode
GPIO9_BE
GPIO22_BE
Description
0
0
Force M4 to load image from flash memory (Default)
0
1
Force M4 to boot in EDL (Emergency Download Mode)
JTAG Mode
GPIO9_BE
GPIO25_BE
GPIO18_BE
Description
0
0
0
No JTAG enabled
0
0
1
JTAG Pins on GPIO[53:50] _ BE
0
1
0
JTAG Pins on GPIO[11:8] _ BE
0
1
1
JTAG Pins on GPIO[27:24] _ BE (default)
1
X
X
Not Allowed
XTAL Mode
GPIO23_BE
Description
0
40MHz Xtal
1
Not Allowed
32.768KHz Sleep Clock Mode
GPIO21_BE
GPIO20_BE
Description
0
0
Chip Internal LPO
0
1
External Crystal 32.768KHz
1
0
External 32.768KHz TCXO Clock connected to GPIO_48_BE
1
1
Not Allowed