MPU Z380
(Continued from previous publications - Room 10,9,8,7)
(C) WLODEK BLACK.
Exchange of commands, sending unit and group search.
New commands:
EX BC, DE BC (15-0) <-> DE (15-0) exchange value pairs
EX BC, HL BC (15-0) <-> HL (15-0) major RON.
In Long Word mode-32 bit
EX A, r A <-> r exchange 8-bit values
accumulator and other registers,
For example, EX A, B; EX A, E.
EX A, (HL) A <-> (HL) exchange values of the battery and
memory, addressable by a pair
HL.
EX r, r 'r <-> r' exchange values of 8-bit
Register and its alternative
"Double", for example, EX B, B '.
EX pp, pp 'pp (15-0) <-> pp' (15-0) Convert 16-bit values
with values and a pair of alternative
couples, for example, EX BC, BC '. In Long Word
mode - 32 bits.
EX XY, XY 'XY (15-0) <-> XY' (15-0) Convert 16-bit values
with values IX or IY with alternatives nym index register.
In Long Word mode - 32 bits.
EX pp, XY pp (15-0) <-> XY (15-0) Convert 16-bit values with
values pairs and index Regis spectrum, for example, EX HL,
IX. In Long Word mode - 32 bits.
EX IX, IY IX (15-0) <-> IY (15-0) Convert 16-bit values with
values between the two index registers.
In Long Word mode - 32 bits.
EXALL SR (1924) <- NOT SR (1924) Switching from the ground to
SR (1916) <- NOT SR (16) alternative, or vice versa
SR (8) <- NOT SR (8) sets IY, IX, BC, DE, HL.
EXXX SR (1916) <- NOT SR (1916) Switching from the ground to
alternate or opposite sets of registers IX
EXXY SR (1924) <- NOT SR (24) The same for IY.
Please note: due to software availability register SR
primary and alternate set of registers are not equal! Software
can determine which of the set of assets! Because of this
should be clearly distinguished EXCHANGE values between
registers and Set switching register!
SWAP pp pp (31-16) <-> pp (15-0) exchange value of the high
and the youngest a 16-bit 32-bit half of the pair. For
example, SWAP HL. Operates independently of the set
format operand word length.
SWAP XY XY (31-16) <-> XY (15-0) Same for the IX, IY.
LDIW (DE) <- (HL) Sending a single
(DE +1) <- (HL +1) words. Address of DE <- DE +2 source
of HL <- HL +2 receiver must be BC (15-0) <- BC (15-0)
-2 even. LDI from this team is different in that in one
machine cycle forwards word, and not
bytes.
LDDW (DE) <- (HL) Shipment words since Dec (DE +1) <- (HL +1)
rementom addresses. DE <- DE-2
HL <- HL-2
BC (15-0) <- BC (15-0) -2
LDIRW Similar command group forward words.
LDDRW runs until BC reaches zero.
General properties LDIW, LDDW, LDIRW, LDDRW:
- In the "longest word" sent two words in one machine
cycle, and BC reduces its value by 4;
- The address of the source and receiver region should be
expressed vneny to even address (which will otherwise
described description of silent);
- Using the "Z80" Addressing looped for Junior 64K.
Group of commands such as CPI, CPIR not expanded and remains
the same. In It also holds zakoltsovannost address within the
64K in non-dilated mode of the processor.
"Old" EX DE, HL; EXX; EX (SP), HL; EX (SP), XY in the "long
the word "work with 32-bit registers in pairs.
For EX (SP), rr holds everything that was said about
zakoltsovannosti addresses.
Group 8-bit arithmetic and logic.
Declared "legitimate" operations with the halves of the index
registers:
ADD A, XYU
ADD A, XYL
and everything related to them - ADC, SUB, SBC, AND, OR, XOR,
CP, as well as increment and decrement operations:
INC XYU DEC XYU
INC XYL DEC XYL
New operations:
TST r A AND r logical AND of the accumulator
and the second operand with the installation
flags, but no infiltration result in the battery. (R - all
valid ways of addressing an operand - both for AND).
TST n A AND n Same with the constant in the role of the second
operand.
TST (HL) A AND (HL) Same as on the contents of the cell, hell
resuemoy pair HL.
[To be continued].
