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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)
Figure 3-5. Value in the Program Counter during Execution of an Indirect Branch Instruction
MSB
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
LSB
PC0
AR9
AR8
AR7
AR6
AR5
AR4
AR3
AR2
AR1
AR0
3.2.3 Program Counter during Execution of Subroutine Calls (CALL)
There are two ways to specify branching using subroutine calls. One is to specify the branch address in the operand
using the direct subroutine call (CALL addr). The other is to branch to the address specified by the address register
using the indirect subroutine call (CALL @AR).
A direct subroutine call causes the value in the program counter to be saved in the stack and then the address
specified in the operand to be placed in the program counter. Direct subroutine calls can specify any address in
program memory.
Figure 3-6. Value in the Program Counter during Execution of a Direct Subroutine Call
MSB
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
LSB
PC0
Address specified by addr
An indirect subroutine call causes the value in the program counter to be saved in the stack and then the value
in the address register to be placed in the program counter.
Figure 3-7. Value in the Program Counter during Execution of an Indirect Subroutine Call
Address stack register n
MSB
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
(n = 0 to 4)
LSB
PC0
AR9
AR8
AR7
AR6
AR5
AR4
AR3
AR2
AR1
AR0
21

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