HCS08 datasheet(132/290 Pages) MOTOROLA

132 / 290 page

Parallel Input/Output

MC9S08GB/GT

132

MOTOROLA

Port A pins are available as general-purpose I/O pins controlled by the port A data (PTAD), data direction

(PTADD), pullup enable (PTAPE) and slew rate control (PTASE) registers. Refer to 8.4 Parallel I/O

Controls for more information about general-pupose I/O control.

Port A can be configured to be keyboard interrupt input pins. Refer to the Keyboard Interrupt (KBI)

Module section for more information about using port A pins as keyboard interrupts pins.

8.3.2 Port B and Analog to Digital Converter Inputs

Figure 8-3 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 ATD

inputs will be forced to act as inputs.

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 8.4 Parallel I/O

Controls for more information about general-pupose 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 the Analog-to-Digital Converter (ATD) Module section for more

information about using port B as a ATD pins.

8.3.3 Port C and SCI2, IIC, and High-Current Drivers

Figure 8-4 Port C Pin Names

Port C is an 8-bit port which is shared among the SCI2 and IIC modules, and general-purpose I/O. When

SCI2 or IIC 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 8.4 Parallel I/O

Controls for more information about general-pupose 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 the Serial Communications Interface (SCI) Module section

for more information about using PTC0 and PTC1 as SCI pins

Port B

Bit 7

654321

Bit 0

MCU Pin:

PTB7/

AD7

PTB6/

AD6

PTB5/

AD5

PTB4/

AD4

PTB3/

AD3

PTB2/

AD2

PTB1/

AD1

PTB0/

AD0

Port C

Bit 7

653321

Bit 0

MCU Pin:

PTC7

PTC6

PTC5

PTC4

PTC3/

SCL

PTC2/

SDA

PTC1/

RxD2

PTC0/

TxD2

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