
Pin Assignments
MC68HC908AS32A Data Sheet, Rev. 2.0
Freescale Semiconductor
25
1.4.7 Analog Ground Pin (VSSA/VREFL)
The VSSA/VREFL pin provides both the analog ground connection and the reference low voltage for the
1.4.8 ADC Reference High Voltage Pin (VREFH)
for more information.
1.4.9 Port A Input/Output (I/O) Pins (PTA7–PTA0)
Ports for more information.
1.4.10 Port B I/O Pins (PTB7/ATD7–PTB0/ATD0)
Port B is an 8-bit special function port that shares all eight pins with the ADC. See
Chapter 31.4.11 Port C I/O Pins (PTC4–PTC0)
PTC4–PTC3 and PTC1–PTC0 are general-purpose bidirectional I/O port pins. PTC2/MCLK is a special
function port that shares its pin with the system clock which has a frequency equivalent to the system
1.4.12 Port D I/O Pins (PTD6–PTD0/ATD8)
Port D is an 7-bit special-function port that shares seven of its pins with the ADC and one of its pins with
1.4.13 Port E I/O Pins (PTE7/SPSCK–PTE0/TxD)
Port E is an 8-bit special function port that shares two of its pins with the TIM, four of its pins with the SPI,
for more information.
1.4.14 Port F I/O Pins (PTF3–PTF0/TCH2)
Port F is a 4-bit special function port that shares four of its pins with the TIM. See
Chapter 17 Timer1.4.15 BDLC Transmit Pin (BDTxD)
more information.