MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 35

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Technical Data — MC68HC912DT128A
2.1 Contents
2.2 Introduction
MC68HC912DT128A — Rev 4.0
MOTOROLA
2.2
2.3
2.4
2.5
2.6
2.7
The CPU12 is a high-speed, 16-bit processing unit. It has full 16-bit data
paths and wider internal registers (up to 20 bits) for high-speed extended
math instructions. The instruction set is a proper superset of the
M68HC11instruction set. The CPU12 allows instructions with odd byte
counts, including many single-byte instructions. This provides efficient
use of ROM space. An instruction queue buffers program information so
the CPU always has immediate access to at least three bytes of machine
code at the start of every instruction. The CPU12 also offers an
extensive set of indexed addressing capabilities.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Indexed Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Opcodes and Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Central Processing Unit
Section 2. Central Processing Unit
Technical Data
35