MC9S12E256VPVE Freescale Semiconductor, MC9S12E256VPVE Datasheet - Page 184

• Manufacturer Part Number: MC9S12E256VPVE
• Description: IC MCU 256K FLASH 25MHZ 112-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12E256VPVE

• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, I²C, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 91
• 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: 112-LQFP
• 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: 92
• 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: 16-ch x 10-bit
• On-chip Dac: 2-ch x 8-bit
• 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: Lead free / RoHS Compliant

Chapter 4 Clocks and Reset Generator (CRGV4)
of 4 OSCCLK plus 4 PLLCLK cycles to make the transition. During the transition, all clocks freeze and
CPU activity ceases.
4.4.3
If no OSCCLK edges are detected within a certain time, the clock monitor within the oscillator block
generates a clock monitor fail event. The CRGV4 then asserts self-clock mode or generates a system reset
depending on the state of SCME bit. If the clock monitor is disabled or the presence of clocks is detected
no failure is indicated by the oscillator block.The clock monitor function is enabled/disabled by the CME
control bit.
4.4.4
The clock monitor performs a coarse check on the incoming clock signal. The clock quality checker
provides a more accurate check in addition to the clock monitor.
A clock quality check is triggered by any of the following events:
A time window of 50000 VCO clock cycles
A number greater equal than 4096 rising OSCCLK edges within a check window is called osc ok. Note that
osc ok immediately terminates the current check window. See
1. VCO clock cycles are generated by the PLL when running at minimum frequency f
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BUS CLOCK / ECLK
CORE CLOCK:
Power-on reset (POR)
Low voltage reset (LVR)
Wake-up from full stop mode (exit full stop)
Clock monitor fail indication (CM fail)
Clock Monitor (CM)
Clock Quality Checker
Figure 4-18. Core Clock and Bus Clock Relationship
MC9S12E256 Data Sheet, Rev. 1.08
1
is called check window.
Figure 4-19
SCM
.
as an example.
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