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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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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
MSB
PC9
PC8
PC7
PC6
PC5
PC
PC4
PC3
PC2
PC1
LSB
PC0
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.
19

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