413
13.1.3
Pin Configuration
Table 13.1 shows the RTC pin configuration.
Table 13.1
RTC Pins
Pin
Signal Name
I/O
Description
RTC oscillator crystal pin
EXTAL2
I
Connects crystal to RTC oscillator
*
2
RTC oscillator crystal pin
XTAL2
O
Connects crystal to RTC oscillator
*
2
Clock input/clock output
TCLK
I/O
External clock input pin/input capture
control input pin/realtime clock (RTC)
output pin (shared by TMU)
Dedicated power-supply pin
for RTC
Vcc–RTC
—
Dedicated power-supply pin for RTC
*
1
Dedicated GND pin for RTC
Vss–RTC
—
Dedicated GND pin for RTC
*
1
Notes:
*
1 Except in hardware standby mode, power must be supplied to all power supply pins,
including these, even when only the RTC is used (including standby mode).
*
2 When the RTC is not used, pull EXTAL2 up (to Vcc) and make no connection for
XTAL2.
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