MC908JB16DWE Datasheet, PDF (36/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

General Description
1.6.6 CGM Power Supply Pins (V_DDA, V_SSA0, V_SSA1)
V_DDA is the power supply pin, V_SSA0 and V_SSA1 are the ground pins for
the analog portion of the clock generator modules (CGMs). Connect
V_DDA to the same voltage potential as V_DD. Connect V_SSA0 and V_SSA1
pins to the same voltage potential as V_SS. Decoupling of these pins
should be as per the digital supply.
1.6.7 CGM Voltage Regulator Out (V_REGA0)
V_REGA0 is the 3.3V output of the second on-chip voltage regulator.
V_REGA0 is used for CGM1 and CGM2 operation. Decoupling of this pin
should be as per the digital V_REG.
1.6.8 CGM Voltage Regulator In (V_REGA1)
V_REGA1 is the 3.3V input pin for CGM2. Connect V_REGA1 directly to
V_REGA0. Decoupling of V_REGA1 pin should be as per V_REGA0.
1.6.9 External Filter Capacitor Pins (CGMXFC1, CGMXFC2)
CGMXFC1 and CGMXFC2 are external capacitor connections for the
respective CGMs.
1.6.10 CGM Clock Output Pins (CGMOUT1, CGMOUT2)
CGMOUT1 and CGMOUT2 are buffered VCO outputs of the respective
CGMs.
1.6.11 Port A Input/Output (I/O) Pins (PTA7/KBA7–PTA0/KBA0)
PTA7/KBA7–PTA0/KBA0 are general-purpose bidirectional I/O port
pins. (See Section 14. Input/Output (I/O) Ports.) Each pin contains a
software configurable pullup device to V_DD when the pin is configured as
an input. (See 14.7 Port Options.) Each pin can also be programmed
as an external keyboard interrupt pin. (See Section 16. Keyboard
Interrupt Module (KBI).)
Technical Data
36
General Description
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor