FREESCALE 68HC11 PDF

Flags 68HC11 block diagram Internally, the HC11 instruction set is upward compatible with the , with the addition of a Y index register. Instructions using the Y register have opcodes prefixed with the byte 0x It has two eight-bit accumulators , A and B, two sixteen-bit index registers , X and Y, a condition code register, a bit stack pointer , and a program counter. A range of bit instructions treat the A and B registers as a combined bit D register for comparison X and Y registers may also be compared to bit memory operands , addition, subtraction and shift operations, or can add the B accumulator to the X or Y index registers.

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It is a CISC microcontroller. The 68HC11 devices are more powerful and more expensive than the 68HC08 microcontrollers, and are used in barcode readers, hotel card key writers, amateur robotics, and various other embedded systems. Instructions using the Y register have opcodes prefixed with the byte 0x It has two eight-bit accumulators , A and B, two sixteen-bit index registers , X and Y, a condition code register, a bit stack pointer , and a program counter.

In addition, some instructions treat the A and B registers as a combined bit D register. Different versions of the HC11 have different numbers of external ports, labeled alphabetically. Each port is eight-bits wide except for D, which is six bits in some variations of the chip, D also has eight bits. It can be operated with an internal program and RAM 1 to bytes or an external memory of up to 64 kilobytes.

With external memory, B and C are used as address and data bus. In this mode, port C is multiplexed to carry both the lower byte of the address and data. When placed on the external address bus, it replicates the original functions of B and C. The Freescale 68HC16 microcontroller is intended as a bit mostly software compatible upgrade of the 68HC Digitized by Google. Retrieved on May 17,

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Motorola 68HC11

It is a CISC microcontroller. The 68HC11 devices are more powerful and more expensive than the 68HC08 microcontrollers, and are used in barcode readers, hotel card key writers, amateur robotics, and various other embedded systems. Instructions using the Y register have opcodes prefixed with the byte 0x It has two eight-bit accumulators , A and B, two sixteen-bit index registers , X and Y, a condition code register, a bit stack pointer , and a program counter.

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