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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 1138.87KB

  • 289頁

  • NEC   NEC

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CHAPTER 4
PROGRAM MEMORY (ROM)
Table 4-1. Vector Address for the
PD17120 Subseries
Vector Address
0000H
0001H
0002H
0003H
Reset
Serial interface interrupt
Timer interrupt
External interrupt (INT pin)
Interrupt Sources
(2) Direct branch
When executing a direct branch (BR addr), the 11-bit instruction operand is used to specify an address in
program memory. (However, the most significant bit must be 0. If an address is specified outside of this
range, an error will occur in the assembler.) A direct branch instruction can be used to branch to any address
in program memory.
(3) Indirect branch
When executing an indirect branch (BR @AR), the program branches to the address specified by the value
stored in the address register (AR). An indirect branch can be used to branch to any address in program
memory.
Also refer to
7.2 ADDRESS REGISTER (AR).
(4) Direct subroutine call
When using a direct subroutine call (CALL addr), the 11-bit instruction operand is used to specify a program
memory address of the called subroutine. (However, the most significant bit must be 0. If an address is
specified outside of this range, an error will occur in the assembler).
25

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