Datasheet

Chapter 6 Parallel Input/Output
MC9S08GB60A Data Sheet, Rev. 2
86 Freescale Semiconductor
6.3.6 Port F and High-Current Drivers
Figure 6-7. Port F Pin Names
Port F is an 8-bit port general-purpose I/O that is not shared with any peripheral module. Port F has high
current output drivers.
Port F pins are available as general-purpose I/O pins controlled by the port F data (PTFD), data direction
(PTFDD), pullup enable (PTFPE), and slew rate control (PTFSE) registers. Refer to Section 6.4, “Parallel
I/O Controls” for more information about general-purpose I/O control.
6.3.7 Port G, BKGD/MS, and Oscillator
Figure 6-8. Port G Pin Names
Port G is an 8-bit port which is shared among the background/mode select function, oscillator, and
general-purpose I/O. When the background/mode select function or oscillator is enabled, the pin direction
will be controlled by the module function.
Port G pins are available as general-purpose I/O pins controlled by the port G data (PTGD), data direction
(PTGDD), pullup enable (PTGPE), and slew rate control (PTGSE) registers. Refer to Section 6.4, “Parallel
I/O Controls” for more information about general-purpose I/O control.
The internal pullup for PTG0 is enabled when the background/mode select function is enabled, regardless
of the state of PTGPE0. During reset, the BKGD/MS pin functions as a mode select pin. After the MCU
is out of reset, the BKGD/MS pin becomes the background communications input/output pin. The PTG0
can be configured to be a general-purpose output pin. Refer to Chapter 3, “Modes of Operation”,
Chapter 5, “Resets, Interrupts, and System Configuration”, and Chapter 15, “Development Support” for
more information about using this pin.
The ICG module can be configured to use PTG2–PTG1 ports as crystal oscillator or external clock pins.
Refer to Chapter 13, “Inter-Integrated Circuit (S08IICV1)” for more information about using these pins as
oscillator pins.
Port F Bit 7654321Bit 0
MCU Pin: PTF7 PTF6 PTF5 PTF4 PTF3 PTF2 PTF1 PTF0
Port G Bit 7654321Bit 0
MCU Pin: PTG7 PTG6 PTG5 PTG4 PTG3
PTG2/
EXTAL
PTG1/
XTAL
PTG0/
BKGD/MS