mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 279

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Technical Data — MC68HC908MR8
14.1 Contents
14.2 Introduction
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
NOTE:
14.2
14.3
14.3.1
14.3.2
14.4
14.4.1
14.4.2
14.5
14.5.1
14.5.2
Fourteen bidirectional input-output (I/O) pins, two input pins, and six
output pins form three parallel ports.
When using the 28-pin package versions of the MC68HC908MR8, set
the data direction register bits in DDRA such that bits 6, 5, and 4 are
written to a logic 1 (along with any other output bits on PORTA). Setting
PORTA’s data direction register bits 6, 5, and 4 will terminate the input
buffers on that port.
Connect any unused I/O pins to an appropriate logic level, either V
V
do not require termination for proper operation, termination reduces
excess current consumption and the possibility of electrostatic damage.
SS
. (PWM6–PWM1 pins require no termination). Although the I/O ports
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .279
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .281
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .284
Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .286
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .281
Data Direction Register A . . . . . . . . . . . . . . . . . . . . . . . .282
Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .284
Data Direction Register B . . . . . . . . . . . . . . . . . . . . . . . .285
Port C Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .287
Data Direction Register C . . . . . . . . . . . . . . . . . . . . . . . .288
Section 14. Input/Output (I/O) Ports
Input/Output (I/O) Ports
Technical Data
DD
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