MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 65

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

7.1 Contents
7.2 Introduction
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Technical Data — MC68HC05K0 • MC68HC05K1
7.2
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.4
7.4.1
7.4.2
7.4.3
7.4.4
The 10 bidirectional input/output (I/O) pins form two parallel I/O ports.
Each I/O pin is programmable as an input or an output. The contents of
the data direction registers determine the data direction of each I/O pin.
All 10 I/O pins have mask-optional pulldown devices.
Freescale Semiconductor, Inc.
For More Information On This Product,
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . .67
Pulldown Register A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Port A External Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Port A Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Data Direction Register B. . . . . . . . . . . . . . . . . . . . . . . . . . .72
Pulldown Register B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Port B Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Section 7. Parallel Input/Output (I/O)
Go to: www.freescale.com
Parallel Input/Output (I/O)
Technical Data