393
FCALL, FCALLP
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7.6
S
tructure cr
eation
instructions
7.6.5
F
CALL
, FCALLP
(4) When function devices (FX, FY, FD) are used by a subroutine program, specify a device with to corresponding to
the function device. The contents to the devices specified by to are as indicated below.
(a) Prior to execution of the subroutine program, bit data is transmitted to FX, and word data is transmitted to FD.
(b) After the execution of the subroutine program, the contents of FY and FD are transmitted to the corresponding
devices.
(c) The processing units for the function devices are as follows:
• FX, FY: Bits
• FD : 4-word units
The size of the data to be dealt with will differ depending on the device specified in the argument. The device
specified as a function device should be secured for the data size. An error will occur if it cannot be secured for the
data size.
*1:
An error will not occur if the device number specified by
to
is not a multiple of 16 at the digit designation of the bit device.
[Main routine program]
(5) The FCALL (P) instruction can use from to .
(6) Up to 16 nesting levels are possible with the FCALL(P) instruction. However, this 16 levels is the total number of levels in
the CALL(P), FCALL(P), ECALL(P), EFCALL(P), and XCALL instructions.
Function devices
Device
Data Size
Remark
• FX
• FY
Bit device
1 point
––––
When Bit Designation has been Made for Word Device
1 bit
• FD
When digit designation of a bit device is used*1
4 words
The upper 2 words of FD become 0.
Word device
4 words
––––
S1
S5
S1
S5
S1
S5
Occupies from D0 to D3
(
Transfer to FD1
)
.
X0
D30
Occupies from D30 to D33
(
Transfer to FD2
)
.
Occupies M0
(
Transfer to FX0
)
.
D0
M0
P0
FCALL
S1
S5
P0
FCALL
P0
CALL
FEND
RET
RET
RET
END
P0
P10
P20
CALL
P10
CALL
P20
FCALL P10
FCALL P20