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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 automotive applications, barcode readers, hotel card key writers, amateur robotics, and various other embedded systems.
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.
Bit test operations have also been added, performing a logical AND function between operands, setting the correct conditions codes, but not modifying the operands. 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. The Freescale 68HC16 microcontroller family is intended as a bit mostly software compatible upgrade of the 68HC When placed on the external address bus, it replicates the original functions of B and C. This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November and incorporated under the "relicensing" terms of the GFDL , version 1.
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