Motorola MVME1X7P - Manual (Page 25)

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The terms control bit, status bit, true, and false are used extensively in this
document. The term control bit is used to describe a bit in a register that
can be set and cleared under software control. The term true is used to
indicate that a bit is in the state that enables the function it controls. The
term false is used to indicate that the bit is in the state that disables the
function it controls. In all tables, the terms 0 and 1 are used to describe the
actual value that should be written to the bit, or the value that it yields when
read. The term status bit is used to describe a bit in a register that reflects
a specific condition. The status bit can be read by software to determine
operational or exception conditions.