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Rev. 5.00, 09/03, page 409 of 760
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.