MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 395

• Manufacturer Part Number: MCF51EM256CLL
• Description: IC MCU 32BIT 256KB FLASH 100LQFP
• Manufacturer: Freescale Semiconductor
• Series: MCF51EMr

Specifications of MCF51EM256CLL

• Core Processor: Coldfire V1
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, SCI, SPI
• Peripherals: LCD, LVD, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 16x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: MCF51EM
• Core: ColdFire V1
• Data Bus Width: 32 bit
• Data Ram Size: 16 KB
• Interface Type: RS-232, LIN
• Maximum Clock Frequency: 50 MHz
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: DEMOEM
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

17.5.4
This register is used to program the seconds counter. It can be read anytime to get the current value of the
counter. Only power-on reset can reset this register. Seconds counter can be set anything between 0 and 59
both included. This register is unaffected by software reset.
MCU should first read the INVAL bit of the IRTC_STATUS (bit 0) to determine that the counters are stable
and they can be changed. The INVAL bit ensures that no operation is done at the boundary of a second
when counters change value. MCU should check the status of this bit both during reads and writes.
Freescale Semiconductor
SECONDS
Reset Value
Reset Value
IRTC_SECONDS
Field (bcd)
Field (bcd)
Field
15–8
Field (bin)
Field (bin)
7–6
5–0
Bit Type
Bit Type
IRTC Seconds Counter Register (IRTC_SECONDS)
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Reserved bits. Not writeable. Read returns zeros.
Reserved bits in Binary mode. Read returns zeros. In BCD mode, these are used.
Seconds Counter Value. Count: 0 – 59
Bit 15
rsvd
rsvd
Bit 7
—
—
Figure 17-5. IRTC Seconds Counter Register (IRTC_SECONDS)
SECONDS (tens)
Bit 14
rsvd
rsvd
Bit 6
—
—
Table 17-5. IRTC_SECONDS Field Description
Bit 13
rsvd
Bit 5
rw
—
0
Seconds Counter Register
Bit 12
rsvd
Bit 4
rw
—
0
Description
Bit 11
rsvd
Bit 3
rw
—
0
SECONDS
SECONDS (units)
Bit 10
rsvd
Bit 2
—
rw
0
Independent Robust Real Time Clock (IRTC)
rsvd
Bit 9
Bit 1
—
rw
0
rsvd
Bit 8
Bit 0
Offset: 0x06
—
rw
0
0x06
0x07
17-11