mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 439

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.2
Due to the nature of VREG being a voltage regulator providing the chip internal power supply voltages
most signals are power supply signals connected to pads.
Table 14-1
14.2.1
Signal V
pin. A chip external decoupling capacitor (100 nF...220 nF, X7R ceramic) between V
smoothen ripple on V
For entering shutdown mode, pin V
14.2.2
Signals V
regulator. Internal precision reference circuits are supplied from these signals. A chip external decoupling
capacitor (100 nF...220 nF, X7R ceramic) between V
supply.
Freescale Semiconductor
V
REGEN
V
V
Name
DDR
V
V
V
DDPLL
V
SSPLL
External Signal Description
V
DDA
DDR
DDA
SSA
DD
SS
(optional)
shows all signals of VREG associated with pins.
V
V
is the power input of VREG. All currents sourced into the regulator loads flow through this
DDR
DDA
/V
Check
(MC9S12E256DGV1)”
SSA
, V
— Regulator Power Input
which are supposed to be relatively quiet are used to supply the analog parts of the
DDR
Chapter 1, “MC9S12E256 Device Overview
SSA
Port
.
—
—
—
—
—
—
—
—
— Regulator Reference Supply
VREG power input (positive supply)
VREG quiet input (positive supply)
VREG quiet input (ground)
VREG primary output (positive supply)
VREG primary output (ground)
VREG secondary output (positive supply)
VREG secondary output (ground)
VREG (Optional) Regulator Enable
Table 14-1. VREG — Signal Properties
DDR
MC9S12E256 Data Sheet, Rev. 1.08
for connectivity of the signals.
should also be tied to ground on devices without a V
NOTE
Function
DDA
and V
Chapter 14 Dual Output Voltage Regulator (VREG3V3V2)
SSA
can further improve the quality of this
Reset State
DDR
—
—
—
—
—
—
—
—
and V
REGEN
SSR
Pull Up
—
—
—
—
—
—
—
—
can
pin.
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