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<h5 class="subsection">Register Names</h5>



   <p>You can use predefined symbols of the form <code>r</code><var>n</var><code>h</code> and

<code>r</code><var>n</var><code>l</code> to refer to the H8/300 registers as sixteen 8-bit

general-purpose registers.  <var>n</var> is a digit from <code>0</code> to

<code>7</code>); for instance, both <code>r0h</code> and <code>r7l</code> are valid

register names.



   <p>You can also use the eight predefined symbols <code>r</code><var>n</var><code></code> to refer

to the H8/300 registers as 16-bit registers (you must use this form for

addressing).



   <p>On the H8/300H, you can also use the eight predefined symbols

<code>er</code><var>n</var><code></code> (<code>er0</code> <small class="dots">...</small> <code>er7</code>) to refer to the 32-bit

general purpose registers.



   <p>The two control registers are called <code>pc</code> (program counter; a

16-bit register, except on the H8/300H where it is 24 bits) and

<code>ccr</code> (condition code register; an 8-bit register).  <code>r7</code> is

used as the stack pointer, and can also be called <code>sp</code>.



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