MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 394

• 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

Independent Robust Real Time Clock (IRTC)
17.5.3
This register is used to program the hours and minutes counter. It can be read anytime to get the current
value of the counters. Only power-on reset can reset this register. Hours counter can be set anything
between 0 and 23 both included. Minutes 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.
17-10
MINUTES
HOURS
Reset Value
Reset Value
15–13
IRTC_HOURMIN
Field
Field (bcd)
Field (bcd)
12–8
Field (bin)
Field (bin)
7–6
5–0
Bit Type
Bit Type
IRTC Hours and Minutes Counter Register (IRTC_HOURMIN)
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Figure 17-4. IRTC Hours and Minutes Counter Register (IRTC_HOURMIN)
Hour Counter Value. Count: 0 – 23. 0 – 11 is AM and 12 – 23 is PM.
Minutes Counter Value. Count: 0 – 59
Reserved bits in Binary mode. Read returns zeros. In BCD mode, these are used.
Reserved bits in Binary mode. Read returns zeros. In BCD mode, these are used.
Bit 15
rsvd
rsvd
Bit 7
—
—
Bit 14
MINUTES (tens)
rsvd
rsvd
Table 17-4. IRTC_HOURMIN Field Descriptions
Bit 6
HOURS (tens)
—
—
Bit 13
rsvd
Bit 5
—
rw
0
Hours and Minutes Counter Register
Bit 12
Bit 4
rw
rw
0
0
Description
Bit 11
Bit 3
rw
rw
0
0
MINUTES
HOURS
MINUTES (ones)
Bit 10
HOURS (units)
Bit 2
rw
rw
0
0
Bit 9
Bit 1
rw
rw
0
0
Freescale Semiconductor
Bit 8
Bit 0
rw
rw
Offset: 0x04
0
0
0x04
0x05