IDEC WindO/I-NV4 User Manual page 35

Example: Data handling
Data type Storing 0FFF (Hex) in LDR0
UBIN16(W)
0FFF (Hex) is handled as 4095 (Dec).
BIN16(I)
0FFF (Hex) is handled as 4095 (Dec).
Data type Storing FFFF (Hex) in LDR0, 0FFF (Hex) in LDR1
bit
31
UBIN32(D)
00001111111111111111111111111111
0FFFFFFF (Hex) is handled as 268435455 (Dec).
bit
31
00001111111111111111111111111111
BIN32(L)
+
The sign bit is 0, so the positive number 0FFFFFFF
(Hex) is handled as 268435455 (Dec).
Data type Storing 1234 (Hex) in LDR0
BCD4(B)
The sign is 1 (Hex), so the binary-coded decimal
value of the positive number 234 (Hex),
handled as 1234 (Dec).
Storing 5678 (Hex) in LDR0, 1234 (Hex) in
Data type
bit
31
00010010001101000101011001111000
BCD8(EB)
+
The sign is 1 (Hex), so the binary-coded decimal
value of the positive number 2345678 (Hex),
handled as 2345678 (Dec).
Data type
BFA0 (Hex)
bit
31
10111111101000000000000000000000
Float32(F)
Sign Exponent
1 01111111
0 1 2
2 +2 +2 +2
Negative
−1.25×2
bit bit
LDR0
15 0
0000111111111111
0FFF (Hex)
bit bit
LDR0
15 0
0000 1111 1111 1111
+ 0FFF (Hex)
bit
LDR1 LDR0
0
0FFFFFFF (Hex)
bit
LDR1 LDR0
0
0FFFFFFF (Hex)
bit bit
LDR0
15 0
0001001000110100
+ 234 (Hex)
LDR1
bit
LDR1 LDR0
0
2345678 (Hex)
Storing 0000 (Hex) in LDR0, BFA0 (Hex) in LDR1
LDR1 LDR0
0000 (Hex)
bit bit bit
23 22 0
Significand
01000000000000000000000
3 4 5 6
2 -2 = 0.25
+2 +2 +2 = 127
127-127
= −1.25
WindO/I-NV4 User's Manual
1 WindO/I-NV4 Specifications
Storing FFFF (Hex) in LDR0
bit
LDR0
15
1111 111111111111
FFFF (Hex)
FFFF (Hex) is handled as 65535 (Dec).
bit
LDR0
15
1111 1111 1111
− FFFF (Hex)
Sign bit is 1, so FFFF (Hex) is two's complement,
handled as -1 (Dec).
Storing FFFF (Hex) in LDR0, FFFF (Hex) in LDR1
bit
LDR1
31
1111 1111111111111111111111111111
FFFFFFFF (Hex)
FFFFFFFF (Hex) is handled as 4294967295 (Dec).
bit
LDR1
31
11111111111111111111111111111111
− FFFFFFFF (Hex)
Sign bit is 1, so two's complement of the negative
number FFFFFFFF (Hex), handled as -1 (Dec).
Storing F765 (Hex) in LDR0
bit
LDR0
15
1111011101100101
− 765 (Hex)
The sign is F (Hex), so the binary-coded decimal
value of the negative number 765 (Hex),
handled as -765 (Dec).
Storing 4321 (Hex) in LDR0, F765 (Hex) in
LDR1
bit
LDR1
31
1111 0111 0110 0101 0100
− 7654321 (Hex)
The sign is F (Hex), so the binary-coded decimal
value of the negative number 7654321 (Hex),
handled as -7654321 (Dec).
2
bit
0
bit
0
1111
bit
LDR0
0
bit
LDR0
0
bit
0
bit
LDR0
0
0011 0010 0001
2-3