Datasheet

Chapter 6 Parallel Input/Output
MC9S08GB60A Data Sheet, Rev. 2
84 Freescale Semiconductor
Port A can be configured to be keyboard interrupt input pins. Refer to Chapter 9, “Keyboard Interrupt
(S08KBIV1),” for more information about using port A pins as keyboard interrupts pins.
6.3.2 Port B and Analog to Digital Converter Inputs
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Figure 6-3. Port B Pin Names
Port B is an 8-bit port shared among the ATD inputs and general-purpose I/O. Any pin enabled as an ATD
input will be forced to act as an input.
Port B pins are available as general-purpose I/O pins controlled by the port B data (PTBD), data direction
(PTBDD), pullup enable (PTBPE), and slew rate control (PTBSE) registers. Refer to Section 6.4, “Parallel
I/O Controls,” for more information about general-purpose I/O control.
When the ATD module is enabled, analog pin enables are used to specify which pins on port B will be used
as ATD inputs. Refer to Chapter 14, “Analog-to-Digital Converter (S08ATDV3),” for more information
about using port B pins as ATD pins.
6.3.3 Port C and SCI2, IIC, and High-Current Drivers
Figure 6-4. Port C Pin Names
Port C is an 8-bit port which is shared among the SCI2 and IIC1 modules, and general-purpose I/O. When
SCI2 or IIC1 modules are enabled, the pin direction will be controlled by the module or function. Port C
has high current output drivers.
Port C pins are available as general-purpose I/O pins controlled by the port C data (PTCD), data direction
(PTCDD), pullup enable (PTCPE), and slew rate control (PTCSE) registers. Refer to Section 6.4, “Parallel
I/O Controls,” for more information about general-purpose I/O control.
When the SCI2 module is enabled, PTC0 serves as the SCI2 module’s transmit pin (TxD2) and PTC1
serves as the receive pin (RxD2). Refer to Chapter 11, “Serial Communications Interface (S08SCIV1),”
for more information about using PTC0 and PTC1 as SCI pins
When the IIC module is enabled, PTC2 serves as the IIC modules’s serial data input/output pin (SDA1)
and PTC3 serves as the clock pin (SCL1). Refer to Chapter 13, “Inter-Integrated Circuit (S08IICV1),” for
more information about using PTC2 and PTC3 as IIC pins.
Port B Bit 7654321Bit 0
MCU Pin:
PTB7/
AD1P7
PTB6/
AD1P6
PTB5/
AD1P5
PTB4/
AD1P4
PTB3/
AD1P3
PTB2/
AD1P2
PTB1/
AD1P1
PTB0/
AD1P0
Port C Bit 7653321Bit 0
MCU Pin: PTC7 PTC6 PTC5 PTC4
PTC3/
SCL1
PTC2/
SDA1
PTC1/
RxD2
PTC0/
TxD2