7220 datasheet(32/303 Pages) RENESAS

32 / 303 page

2-5

7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.1 Central processing unit

• • • • • • • •

On-going routine

(PCH)

M(S)

(S)–1

(S)

(PCL)

M(S)

(S)–1

(PS)

M(S)

(S)

(PCH)

M(S)

(S)+1

(S)

(PCL)

M(S)

(S)+1

(PS)

M(S)

(S)

Execute RTI

Interrupt routine

Execute JSR

(PCH)

M(S)

(S)–1

(S)

(PCL)

M(S)

(S)–1

(S)

(PCH)

M(S)

(PCL)

M(S)

(S)+1

(S)

Execute RTS

•

Subroutine

• • • • • • • •

Interrupt request

•

(PCH) : Contents of high-order 8 bits of program counter

: Contents of low-order 8 bits of program counter

: Contents of processor status register

: Contents of stack pointer

: Memory

: Instruction for returning from interrupt routine to main routine

: Instruction for returning from subroutine to main routine

RTI

RTS

(PCL)

(PS)

(S)

Fig. 2.1.3 Sequence of push onto/pop from a stack during interrupts and subroutine calls

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