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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UPD17P133CS 데이터시트(PDF) 34 Page - NEC |
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UPD17P133CS 데이터시트(HTML) 34 Page - NEC |
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34 / 289 page  CHAPTER 3 PROGRAM COUNTER (PC) The program counter is used to specify an address in program memory. 3.1 PROGRAM COUNTER CONFIGURATION Figure 3-1 shows the configuration of the program counter. The program counters are 10-bit binary counters. This program counter is incremented whenever an instruction is executed. Figure 3-1. Program Counter 3.2 PROGRAM COUNTER OPERATION Normally, the program counter is automatically incremented each time a command is executed. The memory address at which the next instruction to be executed is stored is assigned to the program counter under the following conditions: At reset; when a branch, subroutine call, return, or table referencing instruction is executed; or when an interrupt is received. Sections 3.2.1 to 3.2.7 explain program counter operating during execution of each instruction. MSB PC9 PC PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 LSB 19 |
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