mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 317

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

18.1 Contents
18.2 Introduction
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
Data Sheet — MC68HC908SR12•MC68HC08SR12
NOTE:
18.2
18.3
18.3.1
18.3.2
18.3.3
18.4
18.4.1
18.4.2
18.5
18.5.1
18.5.2
18.5.3
18.6
18.6.1
18.6.2
Thirty-one (31) bidirectional input-output (I/O) pins form four parallel
ports. All I/O pins are programmable as inputs or outputs.
Connect any unused I/O pins to an appropriate logic level, either V
V
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
SS
. Although the I/O ports do not require termination for proper
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
Port A Data Register (PTA) . . . . . . . . . . . . . . . . . . . . . . . . 320
Data Direction Register A (DDRA) . . . . . . . . . . . . . . . . . . . 321
Port A LED Control Register (LEDA) . . . . . . . . . . . . . . . . . 323
Port B Data Register (PTB) . . . . . . . . . . . . . . . . . . . . . . . . 324
Data Direction Register B (DDRB) . . . . . . . . . . . . . . . . . . . 325
Port C Data Register (PTC) . . . . . . . . . . . . . . . . . . . . . . . . 327
Data Direction Register C (DDRC). . . . . . . . . . . . . . . . . . . 329
Port C LED Control Register (LEDC) . . . . . . . . . . . . . . . . . 330
Port D Data Register (PTD) . . . . . . . . . . . . . . . . . . . . . . . . 331
Data Direction Register D (DDRD). . . . . . . . . . . . . . . . . . . 332
Section 18. Input/Output (I/O) Ports
Input/Output (I/O) Ports
Data Sheet
DD
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