MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 410

• 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)
This register stores the time in hours when the Daylight Saving has to be applied or reversed. The CPU
should program the correct hour value (0 – 23) as per the regional settings. For example, if the Daylight
Saving starts at 1:00 AM on March 25 and ends at 1:00 AM on October 28 in 2007 then the time at which
time advances or falls back is acutally 1:59 AM. Hence the CPU should program 1 for the hour count value
(and not 2!) i.e. write 0x0101 in this register. 59 minute count is automatically checked inside IRTC and
hence not required to be programmed. This register has no effect of software reset.
In BCD mode, all eight bits are used to indicate the value of hours in both fields.
17.5.16 IRTC Daylight Saving Month Register (IRTC_DST_MNTH)
DST_START_MONTH
17-26
DST_START_HOUR
DST_END_HOUR
Reset Value
Reset Value
15–13
IRTC_DST_MNTH
Field
15–12
12–8
Field
11–8
7–5
4–0
Field (bcd)
Field (bcd)
Field (bin)
Field (bin)
Bit Type
Bit Type
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Figure 17-17. IRTC Daylight Saving Month Register (IRTC_DST_MNTH)
Reserved bits in Binary mode. Read returns zeros. In BCD mode, these are used.
Hour value when Daylight saving has to start. Valid values: 0 – 23
Reserved bits in Binary mode. Read returns zeros. In BCD mode, these are used.
Hour value when Daylight saving has to end. Valid values: 0 – 23
Bit 15
rsvd
rsvd
Bit 7
—
—
Reserved bits. Read returns zeros.
Month value when Daylight saving has to start. Valid values: 0 – 12
DST_START_MONTH (tens)
DST_END_MONTH (tens)
Table 17-18. IRTC_DST_HOUR Field Descriptions
Table 17-19. IRTC_DST_MNTH Field Descriptions
Bit 14
rsvd
rsvd
Bit 6
—
—
Bit 13
rsvd
rsvd
Bit 5
—
—
Daylight Saving Month Register
Bit 12
rsvd
rsvd
Bit 4
—
—
Description
Description
Bit 11
Bit 3
rw
rw
0
0
DST_START_MONTH (units)
DST_END_MONTH (units)
DST_START_MONTH
DST_END_MONTH
Bit 10
Bit 2
rw
rw
0
0
Bit 9
Bit 1
rw
rw
0
0
Freescale Semiconductor
Bit 8
Bit 0
Offset: 0x24
rw
rw
0
0
0x24
0x25