Technician's Guide to the 68HC11 Microcontroller by Dan Black, Leo Chartrand

By Dan Black, Leo Chartrand

Technician's consultant to the 68HC11 Microcontroller is perfect for readers with very little earlier programming event who are looking to grasp the fundamentals of troubleshooting and programming Motorola's 68HC11 microcontroller. either and software program are lined intimately to supply an entire realizing of the foundations underlying how a microcontroller works. idea is supplemented through examples designed to demonstrate how techniques will be utilized. via studying easy methods to software the 68HC11 at an ordinary point, readers additionally achieve worthy event utilizing manufacturer-specific documentation that prepares them for paintings with different extra subtle microcontrollers.

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Extra info for Technician's Guide to the 68HC11 Microcontroller

Example text

The instruction set on the HC11 consists of 308 unique opcodes derived from 145 mnemonic key words. Many of the mnemonic instructions operate in more than one addressing mode. Thus, 145 unique mnemonic forms can generate 308 opcodes. For example, the LDAA instruction can be implemented using the IMM, DIR, EXT, INDX and INDY addressing modes. Thus, five opcodes are required for the LDAA instruction so that each of these addressing modes can be uniquely expressed to the processor during opcode fetch.

This 8-bit address becomes the low-order byte of the effective address, and the high-order byte of the effective address is $00. The direct mode is used on the HC11 only when the operand is located within the first 256 locations of the memory map, $0000–$00FF. Thus, the direct mode is sometimes called zero-page addressing. The low-order byte of the effective address occupies the operand field of the machine code instruction. 10 effective address of high-byte of 16-bit operand (hhll) effective address of operand (hhll) Comments ;($000B) → A (M) M = hhll = 000B Comments ;($000C) : ($000D) → X (M) : (M + 1) M = hhll = 000C M + 1 = 000D Comments ;(A) → 000E M M = hhll = 000E Examples of HC11 Extended Mode Instructions address.

All load instructions affect only three status flags in the CCR: N and Z reflect the actual condition of the data that was loaded. The V bit is cleared, indicating that the sign (N flag) is correct. Load instructions are complementary to store instructions. 1 Problem: Describe what each of the following instructions accomplishes and then indicate the addressing mode used, effective address(es) of the operand, the operand and resulting status in the CCR, given the following: 0010 81 22 33 44 55 66 77 88 0120 2A 00 A6 00 00 FF 00 00 Address Machine Code Source Code a.

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