3 0001 - Register Operations

3 0001 - Register Operations🔗

package: ledum-bb68

opcode
(ldl r i)

r = bb68-gpr

r : (integer-in 0 15)
i : (integer-in 0 255)

mask: f000

value: 1000

load an 8-bit constant into the register, clearing its higher 8 bits

opcode
(ldh r i)

r = bb68-gpr

r : (integer-in 0 15)
i : (integer-in 0 255)

mask: f000

value: 3000

load an 8-bit constant into the higher 8 bits of the register

macro opcode
(ldw r:bb68-gpr w:bb68-word)

macro documentation test

macro opcode
(ldd p:bb68-gprp l)

Loads 32-bit integer into the specified pair. The higher 16 bits go into the first register and the lower into the second.

private opcode
(ldr* n m)

n = bb68-gpr

m = bb68-gpr

n : (integer-in 0 15)
m : (integer-in 0 15)

mask: ff00

value: 2000

macro opcode
(ldr variant)

variant = dest:bb68-gpr src:bb68-gpr
| dest:bb68-gprp src:bb68-gprp

Copies/moves a value to a register or register pair dest from a given register (pair) src.

private opcode
(swap* n m)

n = bb68-gpr

m = bb68-gpr

n : (integer-in 0 15)
m : (integer-in 0 15)

mask: ff00

value: 2100

macro opcode
(swap variant)

variant = dest:bb68-gpr src:bb68-gpr
| dest:bb68-gprp src:bb68-gprp

Swaps values of a register or register pair dest with a given register (pair) src.