MCF5253CVM140J Freescale Semiconductor, MCF5253CVM140J Datasheet - Page 647

• Manufacturer Part Number: MCF5253CVM140J
• Description: IC MCU 2.1MIPS 140MHZ 225MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF525xr

Specifications of MCF5253CVM140J

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 140MHz
• Connectivity: CAN, EBI/EMI, I²C, QSPI, UART/USART, USB OTG
• Peripherals: DMA, WDT
• Program Memory Type: ROMless
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 1.08 V ~ 1.32 V
• Data Converters: A/D 6x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 225-MAPBGA
• Processor Series: MCF525x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details

Chapter 26
Real-Time Clock
This chapter provides the external signal descriptions, memory map, register descriptions, and functional
descriptions of the Real-Time Clock module of the MCF5253.
The real time clock (RTC) is a mixed-signal circuit which provides an indicator of time (in seconds) for
various purposes in the system. The RTC does not stop running, even when the rest of the system is
powered down, so long as battery voltage (RTC_VDDA) remains above a certain threshold.
26.1
Figure 26-1
26.2
Table 26-1
26.3
The RTC module’s register is accessible via the USB, ATA DMA, and clock integration module memory
space. An RTC control and an RTC status bit are also included in the miscellaneous configuration register.
Freescale Semiconductor
RTC Crystal In
RTC Crystal Out
RTC Supply Voltage
RTC Ground
Block Diagram
External Signal Description
Memory Map and Register Definitions
describes the RTC external signals.
is a block diagram of the functional organization of the RTC block.
RTCCROUT
Signal Name
RTC_CRIN
RTC_VDDA
RTCVSSA
32.768 kHz
Oscillator
Abbreviation
RTCCROUT 32.768 kHz crystal output.
RTC_VDDA Battery supply to RTC
RTC_CRIN
RTCVSSA
Figure 26-1. Real Time Clock Block Diagram
RTC Logic
MCF5253 Reference Manual, Rev. 1
Table 26-1. RTC Signals
32.768 kHz crystal input clock.
Ground for RTC supply
1pps
RTC Power Loss Status
RTC Power Loss Clear
in ATA-DMA
RTC_TIME
Function
To/From ATA-DMA
Config Register
I/O
O
–
–
I
26-1