NXP Semiconductors FREESCALE MC13192, Reference Manual, Page: 12 / 34

System Overview
MC13192EVB Reference Manual, Rev. 1.2
2-2 Freescale Semiconductor
2.2 General-Purpose I/O and Peripheral Ports
Thirty eight pins are shared among general-purpose I/O (GPIO) and on-chip peripheral functions. The
MC9S08GTxx has six I/O ports, which include a total of up to 38 GPIO pins (one pin, PTG0, is output
only).
Many of these pins are shared with on-chip peripherals such as timer systems, external interrupts, or
keyboard interrupts. When these other modules are not controlling the port pins, they revert to GPIO
control.
Immediately after reset, all 38 of these pins are configured as high-impedance general-purpose inputs with
internal pull-up devices disabled.
The port allocation of the general-purpose I/O and on-chip peripheral functions on the EVB are listed in
Table 2-1 .
Table 2-1. GPIO Port Allocation
MCU Port Functionality Input/Output
PTA0/KBIP0 SCI1, RS-232, (RTS) Input
PTA1/KBIP1 SCI1, RS-232, (CTS) Output
PTA2/KBIP2 Switch, SW1 Input
PTA3/KBIP3 Switch, SW2 Input
PTA4/KBIP4 Switch, SW3 Input
PTA5/KBIP5 Switch, SW4 Input
PTA6/KBIP6 SCI2, USB, (CTS) Output
PTA7/KBIP7 SCI2, USB, (RTS) Input
PTB0/AD0 LNA Control Output
PTB1/AD1 Pin Header, J107 Input/Output
PTB2/AD2 Pin Header, J107 Input/Output
PTB3/AD3 Pin Header, J107 Input/Output
PTB4/AD4 MC13192, GPIO1 Input
PTB5/AD5 MC13192, GPIO2 Input
PTB6/AD6 Antenna Control Output
PTB7/AD7 Pin Header, J107 Input/Output
PTC0/TxD2 SCI2, USB, (RXD) Output
PTC1/RxD2 SCI2, USB, (TXD) Input
PTC2/SDA MC13192, ATTNB Output
PTC3/SCL MC13192, RXTXEN Output
PTC4 MC13192, RSTB Output
PTC5 Pin Header, J107 Input/Output