MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 239

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 86
4.38.2
This section lists and describes the signals that connect off chip.
4.38.2.1
RESET is an active-low bidirectional pin. As an input it initializes the MCU asynchronously to a known start-up state. As an
open-drain output it indicates that an MCU-internal reset has been triggered.
4.38.2.2
These pins provide the interface for a crystal to control the internal clock generator circuitry. EXTAL is the external clock input or
the input to the crystal oscillator amplifier. XTAL is the output of the crystal oscillator amplifier. The MCU internal OSCCLK is
derived from the EXTAL input frequency. If OSCE=0, the EXTAL pin is pulled down by an internal resistor of approximately 200
k and the XTAL pin is pulled down by an internal resistor of approximately 700 k.
4.38.2.3
Pin V
An off-chip decoupling capacitor (100 nF...220 nF, X7R ceramic) between V
Freescale Semiconductor
DDR
is the power input of IVREG. All currents sourced into the regulator loads flow through this pin.
shows a block diagram of the OSCLCP.
Signal Description
RESET
EXTAL and XTAL
VDDR — Regulator Power Input Pin
Freescale recommends an evaluation of the application board and chosen resonator or
crystal by the resonator or crystal supplier. Loop controlled circuit is not suited for overtone
resonators and crystals.
Detector
Peak
EXTAL
MM912_634 Advance Information, Rev. 4.0
Figure 86. OSCLCP Block Diagram
Gain Control
NOTE
Rf
VDD = 1.8 V
VSS
DDR
OSCCLK
and V
XTAL
SS
can smooth ripple on V
DDR
.
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