MC68HC908GP32CB Freescale Semiconductor, MC68HC908GP32CB Datasheet - Page 115

• Manufacturer Part Number: MC68HC908GP32CB
• Description: IC MCU 32K FLASH 8MHZ 42-SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GP32CB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 33
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• For Use With: M68EVB908GP32 - BOARD EVALUATION FOR HC908GP32
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Chapter 12
Input/Output (I/O) Ports
12.1 Introduction
Thirty-three (33) bidirectional input-output (I/O) pins form five parallel ports. All I/O pins are programmable
as inputs or outputs. All individual bits within port A, port C, and port D are software configurable with
pullup devices if configured as input port bits. The pullup devices are automatically and dynamically
disabled when a port bit is switched to output mode.
Input pins and I/O port pins that are not used in the application must be terminated. This prevents excess
current caused by floating inputs, and enhances immunity during noise or transient events. Termination
methods include:
Never connect unused pins directly to V
Since some general-purpose I/O pins are not available on all packages, these pins must be terminated
as well. Either method 1 or 2 above are appropriate.
Freescale Semiconductor
Addr.
$0000
$0001
$0002
$0003
1. Configuring unused pins as outputs and driving high or low;
2. Configuring unused pins as inputs and enabling internal pull-ups;
3. Configuring unused pins as inputs and using external pull-up or pull-down resistors.
Register Name
Port C Data Register
Port D Data Register
Port A Data Register
Port B Data Register
(PTC)
(PTD)
(PTA)
(PTB)
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Figure 12-1. I/O Port Register Summary
Bit 7
PTD7
PTA7
PTB7
MC68HC908GP32 Data Sheet, Rev. 10
0
DD
= Unimplemented
or V
PTC6
PTD6
PTA6
PTB6
6
SS
.
PTC5
PTD5
PTA5
PTB5
5
Unaffected by reset
Unaffected by reset
Unaffected by reset
Unaffected by reset
PTA4
PTB4
PTC4
PTD4
4
PTA3
PTB3
PTC3
PTD3
3
PTA2
PTB2
PTC2
PTD2
2
PTA1
PTB1
PTC1
PTD1
1
Bit 0
PTA0
PTB0
PTC0
PTD0
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