HCS08 datasheet(131/290 Pages) MOTOROLA

131 / 290 page

Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

131

MC9S08GB/GT

8.2 Features

Parallel I/O features, depending on package choice, include:

•

A total of 56 general-purpose I/O pins in seven ports (one is output only)

•

High-current drivers on port C and port F pins

•

Hysteresis input buffers

•

Software-controlled pullups on each input pin

•

Software-controlled slew rate output buffers

•

Eight port A pins shared with KBI

•

Eight port B pins shared with ATD

•

Eight high-current port C pins shared with SCI2 and IIC

•

Eight port D pins shared with TPM1 and TPM2

•

Eight port E pins shared with SCI1 and SPI

•

Eight high-current port F pins

•

Eight port G pins shared with EXTAL, XTAL, and BKGD/MS

8.3 Pin Descriptions

The MC9S08GB/GT has a total of 56 parallel I/O pins (one is output only) in seven 8-bit ports

(PTA–PTG). Not all pins are bonded out in all packages. Consult the pin assignment in the Pins and

Connections section for available parallel I/O pins. All of these pins are available for general-purpose I/O

when they are not used by other on-chip peripheral systems.

After reset, BKGD/MS is enabled and therefore is not usable as an output pin until BKGDPE in SOPT is

cleared. The rest of the peripheral functions are disabled. After reset, all data direction and pullup enable

controls are set to 0s. These pins default to being high-impedance inputs with on-chip pullup devices

disabled.

The following paragraphs discuss each port and the software controls that determine each pin’s use.

8.3.1 Port A and Keyboard Interrupts

Figure 8-2 Port A Pin Names

Port A is an 8-bit port shared among the KBI keyboard interrupt inputs and general-purpose I/O. Any pins

enabled as KBI inputs will be forced to act as inputs.

Port A

Bit 7

654321

Bit 0

MCU Pin:

PTA7/

KBIP7

PTA6/

KBIP6

PTA5/

KBIP5

PTA4/

KBIP4

PTA3/

KBIP3

PTA2/

KBIP2

PTA1/

KBIP1

PTA0/

KBIP0

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