SN8P1700
8-bit micro-controller build-in 12-bit ADC
PROGRAM FLAG
The PFLAG includes carry flag (C), decimal carry flag (DC) and zero flag (Z). If the result of operating is zero or there
is carry, borrow occurrence, then these flags will be set to PFLAG register.
PFLAG initial value = xxxx x000
086H
PFLAG
Bit 7
-
-
Bit 6
-
-
Bit 5
-
-
Bit 4
-
-
Bit 3
-
-
Bit 2
C
R/W
Bit 1
DC
R/W
Bit 0
Z
R/W
CARRY FLAG
C = 1: If executed arithmetic addition with occurring carry signal or executed arithmetic subtraction without borrowing
signal or executed rotation instruction with shifting out logic “1”.
C = 0: If executed arithmetic addition without occurring carry signal or executed arithmetic subtraction with borrowing
signal or executed rotation instruction with shifting out logic “0”.
DECIMAL CARRY FLAG
DC = 1: If executed arithmetic addition with occurring carry signal from low nibble or executed arithmetic subtraction
without borrow signal from high nibble.
DC = 0: If executed arithmetic addition without occurring carry signal from low nibble or executed arithmetic subtraction
with borrow signal from high nibble.
ZERO FLAG
Z = 1: After operation, the content of ACC is zero.
Z = 0: After operation, the content of ACC is not zero.
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