80 www.ubicom.com IP2022 Data Sheet 7.0     Memory Reference 7.0.1 Registers (sorted by address) Table 7-1 shows the addresses and reset values of all special-purpose registers in data memory, sorted by their address. Table 7-1  Register Addresses and Reset State Address Name Description Register Status Follow- ing Reset (Power-On,
RST, Brown-Out RST, Watchdog RST) 0x001 Reserved Reserved Reserved 0x002 ADDRSEL Selector for current external/program memory
ADDRX/ADDRH/ADDRL 0000 0000 0x003 ADDRX External/program memory pointer (bits 23:16) 0000 0000 0x004 IPH Indirect Data RAM Pointer (high byte) 0000 0000 0x005 IPL Indirect Data RAM Pointer (low byte, see Section
4.1) 0000 0000 0x006 SPH Data RAM Stack Pointer (high byte) 0000 0000 0x007 SPL Data RAM Stack Pointer (low byte, see Section
4.1) 0000 0000 0x008 PCH Current PC (program counter) bits 15:8 (read-only) 1111 1111 0x009 PCL Virtual register for direct PC modification 1111 0000 0x00A WREG W (working) register 0000 0000 0x00B STATUS STATUS register 1110 0000 0x00C DPH Data Pointer (high byte) 0000 0000 0x00D DPL Data Pointer (low byte, see Section 4.1) 0000 0000 0x00E SPDREG Current speed (read-only, see Section 3.5) 1001 0011 0x00F MULH Multiply result (high byte) 0000 0000 0x010 ADDRH External/program memory address (bits 15:8) 0000 0000 0x011 ADDRL External/program memory address (bits 7:0, see
Section 5.11) 0000 0000 0x012 DATAH External/program memory data (high byte) 0000 0000 0x013 DATAL External/program memory data (low byte) 0000 0000 0x014 INTVECH Interrupt vector (high byte) 0000 0000 0x015 INTVECL Interrupt vector (low byte) 0000 0000 0x016 INTSPD Interrupt speed register 0000 0000 0x017 INTF Port B interrupt flags Undefined 0x018 INTE Port B interrupt enable bits 0000 0000 0x019 INTED Port B interrupt edge select bits 0000 0000