mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 66

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 1 Device Overview MC9S12XD-Family
1.2.4.2
External power and ground for I/O drivers and input to the internal voltage regulator. Because fast signal
transitions place high, short-duration current demands on the power supply, use bypass capacitors with
high-frequency characteristics and place them as close to the MCU as possible. Bypass requirements
depend on how heavily the MCU pins are loaded.
1.2.4.3
Power is supplied to the MCU through V
short-duration current demands on the power supply, use bypass capacitors with high-frequency
characteristics and place them as close to the MCU as possible. This 2.5-V supply is derived from the
internal voltage regulator. There is no static load on those pins allowed. The internal voltage regulator is
turned off, if V
1.2.4.4
V
converters.
1.2.4.5
V
1.2.4.6
Provides operating voltage and ground for the oscillator and the phased-locked loop. This allows the
supply voltage to the oscillator and PLL to be bypassed independently. This 2.5-V voltage is generated by
the internal voltage regulator.
66
DDA
RH
and V
, V
SSA
RL
are the power supply and ground input pins for the voltage regulator and the analog-to-digital
V
and for Internal Voltage Regulator
V
V
V
V
are the reference voltage input pins for the analog-to-digital converter.
REGEN
No load allowed except for bypass capacitors.
No load allowed except for bypass capacitors.
DDR1
DD1
DDA
RH
DDPLL
, V
, V
, V
, V
RL
is tied to ground.
, V
DD2
SSA
DDR2
— ATD Reference Voltage Input Pins
SSPLL
, V
— Power Supply Pins for ATD and V
, V
SS1
— Power Supply Pins for PLL
SSR1
, V
MC9S12XDP512 Data Sheet, Rev. 2.17
SS2
, V
DD
SSR2
— Core Power Pins
and V
NOTE
NOTE
— Power and Ground Pins for I/O Drivers
SS
. Because fast signal transitions place high,
REG
Freescale Semiconductor