Z8F1601 Datasheet, PDF (204/246 Pages) Zilog, Inc. – Z8 Encore Microcontrollers with Flash Memory and 10-Bit A/D Converter

Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
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186
Condition Codes
The C, Z, S and V flags control the operation of the conditional jump (JP cc and JR cc)
instructions. Sixteen frequently useful functions of the flag settings are encoded in a 4-bit
field called the condition code (cc), which forms Bits 7:4 of the conditional jump instruc-
tions. The condition codes are summarized in Table 117. Some binary condition codes can
be created using more than one assembly code mnemonic. The result of the flag test oper-
ation is used to decide if the conditional jump is executed.
Table 117. Condition Codes
Binary
0000
0001
0010
0011
0100
0101
0110
0110
0111
0111
1000
1001
1010
1011
1100
1101
1110
1110
1111
1111
Assembly
Hex Mnemonic Definition
Flag Test Operation
0
F Always False
–
1
LT Less Than
(S XOR V) = 1
2
LE Less Than or Equal
(Z OR (S XOR V)) = 1
3
ULE Unsigned Less Than or Equal (C OR Z) = 1
4
OV Overflow
V=1
5
Ml Minus
S=1
6
Z Zero
Z=1
6
EQ Equal
Z=1
7
C Carry
C=1
7
ULT Unsigned Less Than
C=1
8 T (or blank) Always True
–
9
GE Greater Than or Equal
(S XOR V) = 0
A
GT Greater Than
(Z OR (S XOR V)) = 0
B
UGT Unsigned Greater Than
(C = 0 AND Z = 0) = 1
C
NOV No Overflow
V=0
D
PL Plus
S=0
E
NZ Non-Zero
Z=0
E
NE Not Equal
Z=0
F
NC No Carry
C=0
F
UGE Unsigned Greater Than or Equal C = 0
PS017610-0404
eZ8 CPU Instruction Set