Zilog eZ80

8-bit microprocessor Zilog eZ80eZ80 in a TI-84 Plus CE with 256 KB on-chip RAMGeneral informationLaunched2001Marketed byZilogDesigned byZilogCommon manufacturerZilogPerformanceMax. CPU clock rateto 50 MHzData width8Address width24Architecture and classificationInstruction setZ80ExtensionsADLHistoryPredecessorsZilog Z80Zilog Z180 The Zilog eZ80 is an 8-bit microprocessor designed by Zilog as an updated version of the company's first product, the highly-successful Zilog Z80. The eZ80 is binary compatible with the Z80 instruction set, but it operates almost three times faster at the same clock frequency. eZ80 features an optional mode that expands memory addressing to 16 megabytes. Design Zilog eZ80 registers in ADL mode 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 (bit position) Main registers 0 0 0 0 0 0 0 0 Accumulator (A) Flags (F) AF BCU B C BC DEU D E DE HLU H L HL Alternate (shadow) registers 0 0 0 0 0 0 0 0 Accumulator' (A') Flags' (F') AF' BCU' B' C' BC' DEU' D' E' DE' HLU' H' L' HL' Index registers IXU IXH IXL IX IYU IYH IYL IY Stack Pointer SPL Other registers Interrupt vector (base) 0 0 0 0 0 0 0 0 I Memory base 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 MB