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| 型号： | TMDXEVM5515 |
| 厂商： | Texas Instruments |
| 文件页数： | 108/159页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE DSP FOR C55XX |
| 标准包装： | 1 |
| 类型： | DSP |
| 适用于相关产品： | TMS320C55x 系列 |
| 所含物品： | 板，线缆，CD，电源 |
| 产品目录页面： | 718 (CN2011-ZH PDF) |
| 其它名称： | 296-25753 |
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SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
5.11 Real-Time Clock (RTC)
The device includes a Real-Time Clock (RTC) with its own separated power supply and isolation circuits.
The separate supply and isolation circuits allow the RTC to run with the least possible power consumption,
called RTC only mode. The RTC only mode requires CV DDRTC , LDOI, and DV DDRTC power domains to be
powered, but other power domains can be shut off. See Section 5.11.1 , RTC Only Mode for details. All
RTC registers are preserved (except for RTC Control and RTC Update Registers) and the counter
continues to operate when the device is powered off. The RTC also has the capability to wakeup the
device from idle states via alarms, periodic interrupts, or an external WAKEUP input. Additionally, the RTC
is able to output an alarm or periodic interrupt on the WAKEUP pin to cause external power management
to re-enable power to the DSP Core and I/O. Note: The RTC Core (CV DDRTC ) must be powered by an
external power source even though RTC is not used. None of the on-chip LDOs can power CV DDRTC .
The device RTC provides the following features:
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100-year calendar up to year 2099.
Counts seconds, minutes, hours, day of the week, date, month, and year with leap year compensation
Millisecond time correction
Binary-coded-decimal (BCD) representation of time, calendar, and alarm
24-hour clock mode
Second, minute, hour, day, or week alarm interrupt
Periodic interrupt: every millisecond, second, minute, hour, or day
Alarm interrupt: precise time of day
Single interrupt to the DSP CPU
32.768-kHz crystal oscillator with frequency calibration
Control of the RTC is maintained through a set of I/O memory mapped registers (see Table 5-25 ). Note
that any write to these registers will be synchronized to the RTC 32.768-KHz clock; thus, the CPU must
run at least 3X faster than the RTC. Writes to these registers will not be evident until the next two 32.768-
KHz clock cycles later. Furthermore, if the RTC Oscillator is disabled, no RTC register can be written to.
The RTC has its own power-on-reset (POR) circuit which resets the registers in the RTC core domain
when power is first applied to the CV DDRTC power pin. The RTC flops are not reset by the device's RESET
pin nor the digital core's POR (powergood signal).
The scratch registers in the RTC can be used to take advantage of this unique reset domain to keep track
of when the DSP boots and whether the RTC time registers have already been initialized to the current
clock time or whether the software needs to go into a routine to prompt the user to set the time/date.
5.11.1 RTC Only Mode
The maximum power saving can be achieved by using the RTC only mode. There are hardware and
software requirements to use the RTC only mode.
Hardware Requirements:
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The DSP_LDO_EN pin must be tied to GND or pulled down to GND.
The RTC Core (CV DDRTC ), RTC I/O (DV DDRTC ), and LDO inputs (LDOI) must always be powered.
VDDA_ANA is recommended to be powered from the ANA_LDOO pin. If VDDA_ANA is powered
externally, then it must always be powered.
All other power domains can be totally shut down during the RTC only mode.
A high pulse for a minimum of one RTC clock period (30.5 μs) to the WAKEUP pin is required to wake
up the device from the RTC only mode.
108
Peripheral Information and Electrical Specifications
Product Folder Links: TMS320C5515
Copyright ? 2010–2013, Texas Instruments Incorporated
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