TMS320VC5504 datasheet(22/128 Pages) TI

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TMS320VC5504

Fixed-Point Digital Signal Processor

SPRS609A – JUNE 2009 – REVISED JULY 2009

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Table 3-6. Real-Time Clock (RTC) Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)(3)

DESCRIPTION

NAME

NO.

Real-time clock oscillator output. This pin operates at the RTC core voltage,

CVDDRTC, and supports a 32.768-kHz crystal.

If the RTC oscillator is not used, it can be disabled by connecting RTC_XI to

–

CVDDRTC and RTC_XO to ground (VSS). A voltage must still be applied to CVDDRTC

RTC_XO

CVDDRTC

(see Section 5.2, Recommended Operating Conditions).

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

CVDDRTC and RTC_XO to ground (VSS). A voltage must still be applied to CVDDRTC

–

RTC_XI

(see Section 5.2, Recommended Operating Conditions).

CVDDRTC

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 DVDDRTC voltage. The

–

RTC_CLKOUT pin is enabled/disabled through the RTCCLKOUTEN bit in the RTC

RTC_CLKOUT

O/Z

DVDDRTC

Power Management Register (RTCPMGT). At reset, the RTC_CLKOUT pin is

disabled (high-impedance [Hi-Z]).

The pin is used to WAKEUP the core from idle condition. This pin defaults to an

–

WAKEUP

I/O/Z

input at CVDDRTC powerup, but can also be configured as an active-low open-drain

DVDDRTC

output signal to wakeup an external device from an RTC alarm.

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal

(2)

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 4.8.1, Pullup/Pulldown Resistors.

(3)

Specifies the operating I/O supply voltage for each signal

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