MC9S12A128 MOTOROLA [Motorola, Inc], MC9S12A128 Datasheet - Page 58

• Manufacturer Part Number: MC9S12A128
• Description: Microcontroller unit (MCU)
• Manufacturer: MOTOROLA [Motorola, Inc]

The V
regulator.
V
and the PLL.
V
V
protection.
A.1.3 Pins
There are four groups of functional pins.
A.1.3.1 5V I/O pins
Those I/O pins have a nominal level of 5V. This class of pins is comprised of all port I/O pins, the analog
inputs, BKGD and the RESET pins.The internal structure of all those pins is identical, however some of
the functionality may be disabled. E.g. for the analog inputs the output drivers, pull-up and pull-down
resistors are disabled permanently.
A.1.3.2 Analog Reference
This group is made up by the V
A.1.3.3 Oscillator
The pins XFC, EXTAL, XTAL dedicated to the oscillator have a nominal 2.5V level. They are supplied
by V
A.1.3.4 TEST
This pin is used for production testing only.
A.1.3.5 V
This pin is used to enable the on chip voltage regulator.
DD1
SS1
DDA
NOTE:
DDPLL
, V
and V
, V
DDX
SS1
DDX
, V
REGEN
.
, V
SS2
, V
SSX
DD2
In the following context V
for either V
I
V
I
are internally connected by metal.
DD5
DD
DDR
DD
, V
and V
is used for the sum of the currents flowing into V
is used for V
DDR
denotes the sum of the currents flowing into the V
as well as V
SS2
and V
SSA
are the supply pins for the digital logic, V
, V
SSR
RH
SSR
DD1
SSA
and V
pairs supply the I/O pins, V
and V
, V
, V
DD2
DD5
SSX
RL
SSX
and V
, V
pins.
is used for either V
unless otherwise noted.
SSR
DDPLL
are connected by anti-parallel diodes for ESD
, V
SS
is used for V
DDA
DDR
, V
supplies also the internal voltage
DD1
MC9S12A128 Device Guide — V01.01
DDPLL
DDR
DDA
and V
SS1
, V
and V
, V
DDX
, V
SSPLL
DD2
SS2
DDX
and V
.
and V
; V
supply the oscillator
SS5
DDR
SSPLL
is used
pins.
.
58