UPD17P133CS datasheet(36/289 Pages) NEC

36 / 289 page

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

PC0

LSB

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

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

MSB

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

LSB

Address specified by addr

MSB

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

LSB

AR9

AR8

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

Address stack register n

(n = 0 to 4)

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