MC912DG128ACPV Freescale Semiconductor, MC912DG128ACPV Datasheet - Page 48

• Manufacturer Part Number: MC912DG128ACPV
• Description: IC MCU 128K FLASH 8MHZ 112-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC912DG128ACPV

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: CAN, I²C, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x8/10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 112-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Pinout and Signal Descriptions
3.4.1.2 External Oscillator Connections
3.4.2 E-Clock Output (ECLK)
3.4.3 Reset (RESET)
Technical Data
48
NOTE:
When selecting a crystal, it is recommended to use one with the lowest
possible frequency in order to minimise EMC emissions.
XTAL is the crystal output. The XTAL pin must be left unterminated when
an external CMOS compatible clock input is connected to the EXTAL
pin. The XTAL output is normally intended to drive only a crystal. The
XTAL output can be buffered with a high-impedance buffer to drive the
EXTAL input of another device.
ECLK is the output connection for the internal bus clock. It is used to
demultiplex the address and data in expanded modes and is used as a
timing reference. ECLK frequency is equal to 1/2 the crystal frequency
out of reset. The E-clock output is turned off in single chip user mode to
reduce the effects of RFI. It can be turned on if necessary. In special
single-chip mode, the E-clock is turned ON at reset and can be turned
OFF. In special peripheral mode the E-clock is an input to the MCU. All
clocks, including the E clock, are halted when the MCU is in STOP
mode. It is possible to configure the MCU to interface to slow external
memory. ECLK can be stretched for such accesses.
An active low bidirectional control signal, RESET, acts as an input to
initialize the MCU to a known start-up state. It also acts as an open-drain
Freescale Semiconductor, Inc.
For More Information On This Product,
Pinout and Signal Descriptions
Figure 3-5. External Oscillator Connections
Go to: www.freescale.com
MCU
EXTAL
XTAL
NC
MC68HC912DT128A — Rev 4.0
EXTERNAL OSCILLATOR
CMOS-COMPATIBLE
2 x E
MOTOROLA