MC9S12B128_05 Datasheet, PDF (62/132 Pages) Motorola, Inc – Covers also preliminary MC9S12B64 using MC9S12B128 die

Device User Guide — 9S12B128DGV1/D V01.13
Table 2-2 MC9S12B128 Power and Ground Connection Summary
Pin Number
Mnemonic
112-pin QFP
Nominal
Voltage
Description
VDD1, 2
VSS1, 2
13, 65
14, 66
2.5V
0V
Internal power and ground generated by internal regulator
VDDR
41
VSSR
40
5.0V
0V
External power and ground, supply to pin drivers and internal
voltage regulator.
VDDX
107
VSSX
106
5.0V
0V
External power and ground, supply to pin drivers.
VDDA
83
VSSA
86
5.0V
0V
Operating voltage and ground for the analog-to-digital
converters and the reference for the internal voltage regulator,
allows the supply voltage to the A/D to be bypassed
independently.
VRL
85
0V
Reference voltages for the analog-to-digital converter.
VRH
84
5.0V
VDDPLL
43
VSSPLL
45
2.5V
0V
Provides operating voltage and ground for the Phased-Locked
Loop. This allows the supply voltage to the PLL to be
bypassed independently. Internal power and ground
generated by internal regulator.
VREGEN
97
5.0V Internal Voltage Regulator enable/disable
2.3.1 VDDX, VSSX — Power & Ground Pins for I/O Drivers
External power and ground for I/O drivers. 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.
VDDX and VSSX are the supplies for Ports J, K, M, P, T and S.
2.3.2 VDDR, VSSR — Power & Ground Pins for I/O Drivers & for Internal
Voltage Regulator
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.
VDDR and VSSR are the supplies for Ports A, B, E and H.
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