Denso RC5 - Manual (Page 78)

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3.5.3.5 Type I Variable Write (0101)
(1) Function
This command substitutes the value specified in data area 2 for the Type I
(integer type) global variable of the number specified in data area 1.
(2) Format
Command area (4 bits, input)
0101
Data area 1 (8 bits, input)
The number of the Type I variable for which a value will be substituted.
Any number between I[0] and I[255] can be specified. When the input data
in data area 1 is nn, the value specified in data area 2 will be substituted
for the Type I variable I [nn].
Data area 2 (16 bits, input)
The value to be substituted for the Type I variable specified in data area 1.
Any value between -32768 and 32767 can be set.
Status area (16 bits, output)
Nothing will be output.
(3) Description
The value specified in data area 2 is substituted for the Type I variable
specified in data area 1.
Although the type I variable has a storage area of 32 bits, the 16-bit data
in data area 2 will be substituted for the lower 16 bits. Zero will be
substituted for the upper 16 bits of the Type I variable.