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SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
2.5.2
RTC Terminal Functions
Table 2-6. Real-Time Clock (RTC) Terminal Functions
SIGNAL
NAME
NO.
TYPE (1)
(2)
OTHER (3)
(4)
DESCRIPTION
Real-time clock oscillator output. This pin operates at the RTC core voltage,
CV DDRTC , and supports a 32.768-kHz crystal.
If the RTC oscillator is not used, it can be disabled by connecting RTC_XI to
RTC_XO
A9
O/Z
–
CV DDRTC
CV DDRTC and RTC_XO to floating or grounded. A voltage must still be applied to
CV DDRTC by an external power source (see Section 4.2 , Recommended Operating
Conditions ). None of the on-chip LDOs can power CV DDRTC .
Note: When RTC oscillator is disabled, the RTC registers (I/O address range
1900h – 197Fh) are not accessible.
Real-time clock oscillator input.
If the RTC oscillator is not used, it can be disabled by connecting RTC_XI to
RTC_XI
B9
I
–
CV DDRTC
CV DDRTC and RTC_XO to ground (V SS ). A voltage must still be applied to CV DDRTC
by an external power source (see Section 4.2 , Recommended Operating
Conditions ). None of the on-chip LDOs can power CV DDRTC .
Note: When RTC oscillator is disabled, the RTC registers (I/O address range
1900h – 197Fh) are not accessible.
Real-time clock output pin. This pin operates at DV DDRTC voltage. The
RTC_CLKOUT
D8
O/Z
–
DV DDRTC
RTC_CLKOUT pin is enabled/disabled through the RTCCLKOUTEN bit in the RTC
Power Management Register (RTCPMGT). At reset, the RTC_CLKOUT pin is
disabled (high-impedance [Hi-Z]).
WAKEUP
E8
I/O/Z
–
DV DDRTC
The pin is used to WAKEUP the core from idle condition. This pin defaults to an
input at CV DDRTC powerup, but can also be configured as an active-low open-drain
output signal to wakeup an external device from an RTC alarm.
(1)
(2)
(3)
(4)
I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal, BH = Bus Holder
Input pins of type I, I/O, and I/O/Z are required to be driven at all times. To achieve the lowest power, these pins must not be allowed to
float. When they are configured as input or high-impedance state, and not driven to a known state, they may cause an excessive IO-
supply current. Prevent this current by externally terminating it or enabling IPD/IPU, if applicable.
IPD = Internal pulldown, IPU = Internal pullup. For more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see Section 3.8.1 , Pullup/Pulldown Resistors .
Specifies the operating I/O supply voltage for each signal
Copyright ? 2010–2013, Texas Instruments Incorporated
Product Folder Links: TMS320C5515
Device Overview
17
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