ELC Programming Manual
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3-24
the most significant bit of (D1, D0) is the sign bit.
The range of decimal numbers is from ±1175×10
-41
to ±3402×10
+35
.
3. Decimal floating point can be used in the following instructions.
The conversion instruction for Binary floating point Æ Decimal floating point (DEBCD)
The conversion instruction for Decimal floating point Æ Binary floating point (DEBIN)
4. Zero flag (M1020), Borrow flag (M1021) and carry flag (M1022). The flags that correspond to
the floating point instructions are:
a) Zero flag: when the result is 0, M1020=ON.
b) Borrow flag: when a borrow is generated, M1021=ON
c) Carry flag: when the absolute value of result exceeds usage range, M1022=ON
Index register E, F
The index registers are 16-bit registers. There are 2 index registers for ELC-PB, ELCB-PB models
(E and F), 8 for ELC-PC/PA/PH models (E0~E3, F0~F3), and 16 for ELCM-PH/PA, ELC-PV models
(E0 ~ E7 and F0 ~ F7).
E and F are also 16-bit registers just the same as D-registers.
They are read /write registers.
When using a 32-bit index register, the combination of E, F
are as follows. (E0, F0), (E1, F1), (E2, F2), (E3, F3), (E4, F4),
(E5, F5), (E6, F6), (E7, F7).
F0
E0
E0
F0
16-bit
16-bit
32-bit
Lower wordUpper word
If using a 32-bit register, you must specify an E index register. In this case, the specified E register is
used and its corresponding F register is also used (When the ELC starts-up, it is recommended to
use the MOVP instruction to clear the contents of F and reset it to 0)
As the right figure shows, the addresses will change
based the contents of E, F. This is called “Index”
addressing.
For example, if E0=8 then D20E0 represents
address D (20+8). When F0=14, the destination
address becomes D24.
E0=8 F0=14
20+8=28 10+14=24
D28 D24
M1000
D20E0 D10F0MOV
Data types supported in ELC-PB, ELCB-PB series: P, X, Y, M, S, KnX, KnY, KnM, KnS, T, C, D.
Data types supported in ELC-PC/PA/PH, ELCM-PH/PA series: P, X, Y, M, S, KnX, KnY, KnM, KnS, T,
C, D.
Data types supported in ELC-PV series: P, I, X, Y, M, S, K, H, KnX, KnY, KnM, KnS, T, C, D.
If E and F are used with a constant value, use @ between the K or H value and the E or F index
register. For example: "MOV K10@E0 D0F0”
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