UPD750064CU datasheet(21/82 Pages) NEC

21 / 82 page

µPD750064, 750066, 750068, 750064(A), 750066(A), 750068(A)

Data Sheet U10165EJ2V0DS00

Figure 5-3. Program Memory Map (

µPD750068)

0000H

Address

0002H MBE RBE

INTBT/INT4

(high-order 5 bits)

start address

0004H MBE RBE

INT0

(high-order 5 bits)

start address

0006H MBE RBE

INT1

(high-order 5 bits)

start address

0008H MBE RBE

INTCSI

(high-order 5 bits)

start address

000AH MBE RBE

INTT0

(high-order 5 bits)

start address

0020H

007FH

0080H

07FFH

0800H

MBE RBE

Internal reset start address

(high-order 5 bits)

0FFFH

1000H

1FFFH

GETI instruction reference table

000CH MBE RBE

INTT1

(high-order 5 bits)

start address

(low-order 8 bits)

CALLF

! faddr

instruction

entry

address

BRCB ! caddr

instruction

branch

address

Branch address

of BR BCXA, BR

BCDE, BR ! addr,

BRA ! addr1Note or

CALLA ! addr1Note

instruction

CALL ! addr

instruction

subroutine entry

address

BR $ addr

instruction relative

branch address

–15 to –1,

+2 to +16

Branch destination

address and

subroutine entry

address when GETI

instruction is executed

BRCB ! caddr

instruction

branch

address

765

Internal reset start address

INTBT/INT4

INT0

INT1

INTCSI

INTT0

INTT1

start address

Note

Can be used only in the Mk II mode.

Remark In addition to the above, a branch can be taken to the address indicated by changing only the low-order

eight bits of PC by executing the BR PCDE or BR PCXA instruction.

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