UPD17P136ACT datasheet(38/292 Pages) NEC

38 / 292 page

CHAPTER 3 PROGRAM COUNTER (PC)

An indirect branch instruction causes the address in the address counter to be placed in the program counter.

Figure 3-5. Value in the Program Counter during Execution of a BR @AR Instruction

Remark The shaded part is effective only in the case of

µPD17136A/17137A/17P136A/17P137A.

3.2.3 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 branch to the address specified by the address register

using the indirect subroutine call (CALL @AR).

A CALL addr 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. CALL addr can specify 000H-03FFH in the

µPD17134A and 17135A,

and 0000H-07FFH in the

µPD17136A, 17137A, 17P136A, and 17P137A.

Figure 3-6. Value in the Program Counter during Execution of a CALL addr

Remark The shaded part is effective only in the case of

µPD17136A/17137A/17P136A/17P137A.

A CALL @AR causes the value in the program counter to be saved in the stack and then the value in the address

PC10

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

MSB

LSB

AR10

AR8

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

PC9

AR9

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

MSB

LSB

Address specified in the addr

PC10

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