mirror8b:
;r16 = bit reversed r16
;14 clocks + ret
	mov	r17,r16	;76543210 c

	rol	r16	;6543210c 7
	ror	r17	;77654321 0
	rol	r16	;543210c0 6
	ror	r17	;67765432 1
	rol	r16	;43210c01 5
	ror	r17	;56776543 2
	rol	r16	;3210c012 4
	ror	r17	;45677654 3
	rol	r16	;210c0123 3

	andi	r16,$0F	;oooo0123
	andi	r17,$F0	;4567oooo

	or	r16,r17	;45670123
	swap	r16	;01234567

	ret

mirror16:
;r6 = bit reversed r7, r7 = bit reversed r6
;17 clocks + ret
;Initial state:	r6 =	 hgfedcba
;		r7 =	 HGFEDCBA
;		CY  =	 	  y
	rol	r6	;gfedcbay h
	ror	r7	;hHGFEDCB A
	rol	r6	;fedcbayA g
	ror	r7	;ghHGFEDC B
	rol	r6	;edcbayAB f
	ror	r7	;fghHGFED C
	rol	r6	;dcbayABC e
	ror	r7	;efghHGFE D
	rol	r6	;cbayABCD d
	ror	r7	;defghHGF E
	rol	r6	;bayABCDE c
	ror	r7	;cdefghHG F
	rol	r6	;ayABCDEF b
	ror	r7	;bcdefghH G
	rol	r6	;yABCDEFG a
	ror	r7	;abcdefgh H
	rol	r6	;ABCDEFGH y

	ret

;256-byte table based version, 4 clocks + return
mirror8t:
	ldi	zh,high(mirrtab)
	lpm	zl,z
	ret