This is the 16-bit register that holds OSU8's Stack Pointer. Either of two sources can load the register, depending on the state of SLEB, and the upper and lower 8-bit may be separately enabled by ENL and ENH.

Schematic Drawing

OSU8: Simple 8-Bit Microprocessor Design; Paul Stoffregen
http://www.pjrc.com/tech/osu8/sch/reg16b_sp.html
Last updated: February 24, 2005
Status: These pages are a work-in-progress
Comments, Suggestions: <paul@pjrc.com>