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Mnemonic
RST
RESET SYSTEM. Initializes the PSW to zero,
the PC to 2080H (FF2080H in 1-Mbyte
mode), and the pins and SFRs to their reset
values. Executing this instruction causes the
RESET# pin to be pulled low for 16 state
times.
64-Kbyte mode:
←
SFR
Reset Status
←
Pin
Reset Status
←
PSW
0
←
PC
2080H
1-Mbyte mode:
←
SFR
Reset Status
←
Pin
Reset Status
←
PSW
0
←
PC
FF2080H
Z
0
SCALL
SHORT CALL. Pushes the contents of the
program counter (the return address) onto
the stack, then adds to the program counter
the offset between the end of this instruction
and the target label, effecting the call. The
offset must be in the range of –1024 to
+1023.
64-Kbyte mode:
←
SP
SP – 2
←
(SP)
PC
←
PC
PC+11-bit disp
1-Mbyte mode:
←
SP
SP – 4
←
(SP)
PC
←
PC
PC+11-bit disp
Z
—
SETC
SET CARRY FLAG. Sets the carry flag.
←
C
1
Z
—
Table A-6. Instruction Set (Continued)
Operation
PSW Flag Settings
N
C
V
VT
ST
0
0
0
0
0
PSW Flag Settings
N
C
V
VT
ST
—
—
—
—
—
PSW Flag Settings
N
C
V
VT
ST
—
1
—
—
—
INSTRUCTION SET REFERENCE
Instruction Format
RST
(11111111)
SCALL
cadd
(00101xxx) (disp-low)
NOTE: The displacement (disp) is sign-
extended to 16-bits in the 64-
Kbyte addressing mode and to 24
bits in the 1-Mbyte addressing
mode. This displacement may
cause the program counter to
cross a page boundary in 1-Mbyte
mode.
SETC
(11111001)
A-35
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