System clock – Digi NS9215 User Manual
Page 43
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P I N O U T ( 2 6 5 )
System clock
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43
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S y s t e m c l o c k
T14
gpio_a[2]
U
I/O
4
0
addr[26]
1
Reserved 1 cs0_we_n
2
Ext Int Ch 2 (dup)
3
gpio_a[2], SPI boot
P12
gpio_a[3]
U
I/O
4
0
addr[27]
1
Reserved 1 cs0_oe_n
2
UART ref clock
3
gpio_a[3], Endian
a. There is a possible conflict when gpio12 is used as the I2C_SDA signal. in this case the I2C_SDA signal is driven low
while in reset, then driven active high after end of reset, until software configures this pin for the I2C function.
Pin
Signal
U/D
I/O
OD
Description
Pin
Signal
U/D
I/O
OD
Description
L16
x1_sys_osc
I
System oscillator circuit in
L17
x2_sys_osc
O
System oscillator circuit out
M15
sys_pll_dvdd
P
PLL clean power
M16
sys_pll_dvss
P
PLL clean ground
P2
x1_rtc_osc
I
RTC oscillator circuit in (32.768 KHz)
R2
x2_rtc_osc
O
RTC oscillator circuit out