MC3S12RG128 Datasheet, PDF (62/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1 Device Overview (MC3S12RG128V1)
1.2.3.56 PS0 / RXD0 — Port S I/O Pin 0
PS0 is a general purpose input or output pin. It can be configured as the receive pin RXD of Serial
Communication Interface 0 (SCI0).
1.2.3.57 PT[7:0] / IOC[7:0] — Port T I/O Pins [7:0]
PT7-PT0 are general purpose input or output pins. They can be configured as input capture or output
compare pins IOC7-IOC0 of the Enhanced Capture Timer (ECT).
1.2.4 Power Supply Pins
MC3S12RG128 power and ground pins are described below.
Table 1-5. MC3S12RG128 Power and Ground Connection Summary
Mnemonic
V_DD1,2
V_SS1,2
V_DDR
V_SSR
V_DDX
V_SSX
V_DDA
V_SSA
Pin Number
112-pin QFP
13, 65
14, 66
41
40
107
106
83
86
V_RL
85
V_RH
84
V_DDPLL
43
V_SSPLL
45
VREGEN
97
Nominal
Voltage
Description
2.5V
0V
5.0V
0V
5.0V
0V
5.0V
0V
0V
5.0V
2.5V
0V
5V
Internal power and ground generated by internal regulator
External power and ground, supply to pin drivers and internal voltage
regulator.
External power and ground, supply to pin drivers.
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.
Reference voltages for the analog-to-digital converter.
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.
Internal Voltage Regulator enable/disable
NOTE
All VSS pins must be connected together in the application.
1.2.4.1 V_DDX,V_SSX — 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.
MC3S12RG128 Data Sheet, Rev. 1.05
62
Freescale Semiconductor