RM0004 Datasheet, PDF(811/1176 Page) STMicroelectronics – Programmer’s reference manual for Book E processors

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RM0004 Datasheet, PDF (811/1176 Pages) STMicroelectronics – Programmer’s reference manual for Book E processors

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Instruction set

RM0004

subfze

Book E User

Subtract from zero extended

subfze

subfze.

subfzeo

subfzeo.

rD,rA

rD,rA

rD,rA

rD,rA

subfze

(OE=0, Rc=0)

(OE=0, Rc=1)

(OE=1, Rc=0)

(OE=1, Rc=1)

0

56

10 11

15 16

20 21 22

30 31

011111

rD

rA

///

OE 0 1 1 0 0 1 0 0 0 Rc

if E=0 then Cin â CA

carry0:63 â Carry(Â¬rA + Cin)

sum0:63 â Â¬rA + Cin

if OE=1 then do

if Rc=1 then do

OV â carry32 â carry33

SO â SO | (carry32 â carry33)

LT â sum32:63 < 0

GT â sum32:63 > 0

EQ â sum32:63 = 0

CR0 â LT || GT || EQ || SO

rD â sum

CA â carry32

For subfze[o][.], the sum of the oneâs complement of the contents of rA and CA is placed

into rD.

Other registers altered:

â CA

CR0 (if Rc=1)

SO OV (if OE=1)

811/1176

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