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Individual Instruction Descriptions
4-104
4.14.21 IN Input From Port Into Word
Syntax
[label] name dest, src1
Clock,
clk
Word,
w
With RPT,
clk
Class
IN {
adrs
}, port4 Table 4–46 Table 4–46 6a
IN A
n
[~],
port6
1 1 n
R
+3 6b
Execution
dest
⇐ content of
port6
or
port4
PC ⇐ PC +
w
Flags Affected
dest
is A
n
: OF, SF, ZF, CF are set accordingly
dest
is {
adrs}
XZF, XSF are set accordingly
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IN {adrs}, port4
1 1 0 0 0
port4 adrs
x
dma16
(for direct) or
offset16
(long relative) [see section 4.13]
IN A
n
[~],
port6
1 1 1 0 1 1 0 A
n port6
~A
Description Input from I/O port. Words can be input to memory from one of 16 port
addresses or one of 48 port addresses. The
port4
address is multiplied by 4
to get the actual port address.
See Also INS, OUT, OUTS
Example 4.14.21.1 IN *R0, 0x0c
Input data from port address 0x0c * 4 = 0x30 to data memory location pointed by R0.
Example 4.14.21.2 IN A2~, 0x3d
Input data from port address 0x3d to accumulator A2~.