MC9S12E256VFUE Freescale Semiconductor, MC9S12E256VFUE Datasheet - Page 103

• Manufacturer Part Number: MC9S12E256VFUE
• Description: IC MCU 256K FLASH 25MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12E256VFUE

• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, I²C, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 60
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.35 V ~ 2.75 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 80-QFP
• Processor Series: S12E
• Core: HCS12
• Data Bus Width: 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, SCI, SPI
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 60
• Number Of Timers: 12
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWHCS12
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• On-chip Dac: 8 bit, 2 Channel
• Package: 80PQFP
• Family Name: HCS12
• Maximum Speed: 50 MHz
• For Use With: M68EVB912E128 - BOARD EVAL FOR MC9S12E128/64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Freescale Semiconductor
TRY TO DECREASE Tbus
Figure 2-22. Determination Procedure for PRDIV8 and FDIV Bits
FDIV[5:0]=PRDCLK[MHz]*(5+Tbus[ s])-1
YES
ALL COMMANDS IMPOSSIBLE
FCLK=(PRDCLK)/(1+FDIV[5:0])
PRDCLK[MHz]*(5+Tbus[ s])
1/FCLK[MHz] + Tbus[ s] > 5
PRDCLK=oscillator_clock/8
MC9S12E256 Data Sheet, Rev. 1.08
PRDIV8=0 (reset)
FCLK > 0.15 MHz
FDIV[5:0] > 4?
OSCILLATOR
Tbus < 1 s?
> 12.8 MHZ?
an integer?
PRDIV8=1
START
CLOCK
AND
?
YES
YES
YES
NO
NO
NO
NO
PRDCLK=oscillator_clock
YES
NO
FDIV[5:0]=INT(PRDCLK[MHz]*(5+Tbus[ s]))
ALL COMMANDS IMPOSSIBLE
Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
END
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