MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 441

• 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

19.4.3
MTIMxCNTH is the read-only value of the high byte of current MTIM16 16-bit counter.
MTIMxCNTL is the read-only value of the low byte of current MTIM16 16-bit counter.
Freescale Semiconductor
CNTH
CLKS
Field
Field
7:6
5:4
3:0
PS
7:0
Reset:
W
R
Unused register bits, always read 0.
Clock Source Select — These two read/write bits select one of four different clock sources as the input to the
MTIM16 prescaler. Changing the clock source while the counter is active does not clear the counter. The count
continues with the new clock source. Reset clears CLKS to 00.
00
01
10
11
Clock Source Prescaler — These four read/write bits select one of nine outputs from the 8-bit prescaler. Changing
the prescaler value while the counter is active does not clear the counter. The count continues with the new
prescaler value. Reset clears PS to 0000.
0000 Encoding 0. MTIM16 clock source ÷ 1
0001 Encoding 1. MTIM 16clock source ÷ 2
0010 Encoding 2. MTIM16 clock source ÷ 4
0011 Encoding 3. MTIM16 clock source ÷ 8
0100 Encoding 4. MTIM16 clock source ÷ 16
0101 Encoding 5. MTIM16 clock source ÷ 32
0110 Encoding 6. MTIM16 clock source ÷ 64
0111 Encoding 7. MTIM16 clock source ÷ 128
1000 Encoding 8. MTIM16 clock source ÷ 256
All other encodings default to MTIM16 clock source ÷ 256.
MTIM16 Count (High Byte)— These eight read-only bits contain the current high byte value of the 16-bit counter.
Writing has no effect to this register. Reset clears the register to 0x00.
MTIM16 Counter Register High/Low (MTIMxCNTH:L)
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Encoding 0. Bus clock (BUSCLK)
Encoding 1. Fixed-frequency clock (XCLK)
Encoding 3. External source (TCLK pin), falling edge
Encoding 4. External source (TCLK pin), rising edge
7
0
Figure 19-4. MTIMx16 Counter Register High (MTIMxxCNTH)
0
6
Table 19-4. MTIMxCNTH Field Descriptions
Table 19-3. MTIMxCLK Field Descriptions
0
5
0
4
Description
Description
CNTH
0
3
0
2
16-Bit Modulo Timer (MTIM16)
0
1
0
0
19-5