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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC705SP7 датащи(PDF) 42 Page - Freescale Semiconductor, Inc |
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68HC705SP7 датащи(HTML) 42 Page - Freescale Semiconductor, Inc |
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42 / 230 page  Central Processor Unit (CPU) General Release Specification MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 Central Processor Unit (CPU) 3.6 Program Counter (PC) The program counter is a 16-bit register that contains the address of the next instruction or operand to be fetched as shown in Figure 3-5. The three most significant bits of the program counter are ignored internally and appear as 111 during stacking and subroutine calls. Normally, the address in the program counter automatically increments to the next sequential memory location every time an instruction or operand is fetched. Jump, branch, and interrupt operations load the program counter with an address other than that of the next sequential location. 3.7 Condition Code Register (CCR) The condition code register is an 8-bit register whose three most significant bits are permanently fixed at 111 as shown in Figure 3-6. The condition code register contains the interrupt mask and four flags that indicate the results of the instruction just executed. The following paragraphs describe the functions of the condition code register. Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Bit 0 Read: 11 1 Write: Reset: 0 0 0 Loaded with Vector from $1FFE and $1FFF Figure 3-5. Program Counter (PC) Bit 7 654321 Bit 0 Read: 111 H I N C Z Write: Reset: 1 1 1U1U U U U = Unaffected Figure 3-6. Condition Code Register (CCR) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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