摩托罗拉68k：了解状态注册器标志状态

Question

I'm having trouble understanding how exactly the Status Register (SR) content works.

Let's say that the content of (SR) = $0300. How would I figure out in which states the flags are?
Of course that would also answer the question, if the flags are in [insert states here], (SR) = $????

Answer 1

Convert the SR contents to binary, write it next to the boxes:

Most of the bits are just flags and signal a yes/no condition, except the Interrupt Priority Mask, which actually is a number between 0 and 7.

$0300 = 0b0000001100000000

T 0 S 003000 XNZVC

meaning

• No Trace mode
• No Supervisor mode
• Interrupt priority level: 3
• No extent, negative, zero, overflow or carry condition