UPD750004A datasheet(49/84 Pages) NEC

49 / 84 page

µPD750004, 750006, 750008, 750004(A), 750006(A), 750008(A)

Group

Subrou-

tine stack

control

Mne-

monic

RETNote

RETSNote

Operand

Bytes

Machin-

ing

cycle

3 + S

Skip

condition

Uncondition

Address-

ing area

Operation

•

µPD750004

PC11-0

← (SP) (SP + 3) (SP + 2)

MBE, RBE, 0, 0

← (SP + 1), SP ← SP + 4

•

µPD750006, 750008

PC11-0

← (SP) (SP + 3) (SP + 2)

MBE, RBE, 0, PC12

← (SP + 1)

← SP + 4

•

µPD750004

×, ×, MBE, RBE ← (SP + 4)

0, 0, 0, 0

← (SP + 1)

PC11-0

← (SP) (SP + 3) (SP + 2)

← SP + 6

•

µPD750006, 750008

×, ×, MBE, RBE ← (SP + 4)

MBE, 0, 0, PC12

← (SP + 1)

PC11-0

← (SP) (SP + 3) (SP + 2)

← SP + 6

•

µPD750004

MBE, RBE, 0, 0

← (SP + 1)

PC11-0

← (SP) (SP + 3) (SP + 2)

← SP + 4

then skip unconditionally

•

µPD750006, 750008

MBE, RBE, 0

← PC12 ← (SP + 1)

PC11-0

← (SP) (SP + 3) (SP + 2)

← SP + 4

then skip unconditionally

•

µPD750004

0, 0, 0, 0

← (SP + 1)

PC11-0

← (SP) (SP + 3) (SP + 2)

×, ×, MBE, RBE ← (SP + 4)

← SP + 6

then skip unconditionally

•

µPD750006, 750008

0, 0, 0, PC12

← (SP + 1)

PC11-0

← (SP) (SP + 3) (SP + 2)

×, ×, MBE, RBE ← (SP + 4)

← SP + 4

then skip unconditionally

Note The shaded portion is supported in Mk

ΙΙ mode only. The other portions are supported in Mk Ι mode only.

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