MPU Z380
[Continued. Previous publications - in numbers 15,14,12,11,10,
9,8,7]
(C) WLODEK BLACK
Command group transitions
Mnemonic Meaning Commentary
New commands:
JR ee PC <- PC + ee +4 relative shift of two byte offset,
counting emomu of instruction code that follows the JR
(4 bytes)
JR cc, ee same - go for the condition C, NC, Z, NZ
JR eee PC <- PC + eee +5 on the transition to 3-by tovomu
shift, measured of the next instruction (5 bytes)
JR cc, eee same - go for the condition C, NC, Z, NZ
DJNZ ee B <- B-1;
If B is not 0, then PC <- PC + ee +4
Otherwise - PC <- PC +4
Operator cycle register B
with respect to the transition to a 2-byte shift Niya
on the following instructions (4 bytes)
DJNZ eee B <- B-1;
If B is not 0, then PC <- PC + eee +5
Else PC <- PC +5
Same with the transition to a 3-byte offset th
Group of commands to access routines
and return from subroutines
New commands:
CALR e (SP-1) <- PCh Go to the subprogramme include (SP-2) <-
PCl with respect to the next team SP <- SP-2 Offset e
PC <- PC + e +3
CALR cc, e The same condition on Z, NZ, C, NC, S, NS, NV, V,
PE, PO, P, M
CALR ee (SP-1) <- PCh Go to the subprogramme include (SP-2) <-
PCl with respect to the next team SP <- SP-2 2-byte
offset ee PC <- PC + ee +4
CALR cc, ee Same as on the conditions for CALR cc, e
CALR eee (SP-1) <- PCh Go to the subprogramme include (SP-2) <-
PCl with respect to the next team SP <- SP-2 3-byte
offset eee PC <- PC + eee +5
CALR cc, eee Same as on the conditions for CALR cc, e
In Advanced mode, the CPU is stored in a stack of 4-byte
return address, respectively, the stack grows by 4 values.
When using the "old" RST commands in advanced mode
the missing bits to 32 bits are complemented with zeros.
If you are using a non-dilated relative addressing mode of the
processor address is calculated modulo 65536; older 16-bit = 0.
In all cases, e, ee, eee - MSB is the sign.
P.S. Amendment:
In the 15 th issue has crept typo. Published by:
DIVUV [HL,] pp.
Needed:
DIVUW [HL,] pp.
I express my apologies to readers!
[To be continued].
