IP2022 Data Sheet www.ubicom.com 83 7.0 Register Quick Reference 7.1 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 Reset
Value 0x001 Reserved Reserved Reserved 0x002 ADDRSEL Selector for cur-
rent exter-
nal/program
memory pointer 00000000 0x003 ADDRX External/pro-
gram memory
pointer (bits
23:16) 00000000 0x004 IPH Indirect Pointer
(high byte) 00000000 0x005 IPL Indirect Pointer
(low byte) 00000000 0x006 SPH Stack Pointer
(high byte) 00000000 0x007 SPL Stack Pointer
(low byte) 00000000 0x008 PCH Current PC bits
15:8 (read-only) 11111111 0x009 PCL Virtual register
for direct PC
modification 11110000 0x00A W W register 00000000 0x00B STATUS STATUS register  On POR or RST Reset: 11100000 OnBrown-out
Reset: 11101000 On WDT
Overflow: 11110000 0x00C DPH Data Pointer
(high byte) 00000000 0x00D DPL Data Pointer
(low byte) 00000000 0x00E SPDREG Current speed
(read-only) 10010011 0x00F MULH Multiply result
(high byte) 00000000 0x010 ADDRH External/pro-
gram memory
pointer (bits
15:8) 00000000 0x011 ADDRL External/pro-
gram memory
pointer (bits 7:0) 00000000 0x012 DATAH External/pro-
gram memory
data (high byte) 00000000 0x013 DATAL External/pro-
gram memory
data (low byte) 00000000 0x014 INTVECH Interrupt vector
(high byte) 00000000 0x015 INTVECL Interrupt vector
(low byte) 00000000 0x016 INTSPD Interrupt speed
register 00000000 0x017 INTF Port B interrupt
flags Undefined 0x018 INTE Port B interrupt
enable bits 00000000 0x019 INTED Port B interrupt
edge select bits 00000000 0x01A FCFG Flash configura-
tion register 00000000 0x01B TCTRL Timer 1/2 com-
mon control reg-
ister 00000000 0x01C XCFG Extended con-
figuration 00000001 0x01D Reserved Reserved Reserved 0x01E IPCH Interrupt return
address (high
byte) 00000000 Table 7-1  Register Addresses and Reset State (contin- Address Name Description Reset
Value