User guide

Data Watchpoint and Trace Unit
ARM DDI 0337I Copyright © 2005-2008, 2010 ARM Limited. All rights reserved. 8-4
ID072410 Non-Confidential
8.3 DWT Programmers Model
Table 8-1 lists the DWT registers. Depending on the implementation of your processor, some of
these registers might not be present. Any register that is configured as not present reads as zero.
Table 8-1 DWT register summary
Address Name Type Reset Description
0xE0001000 DWT_CTRL RW
See
a
Control Register
0xE0001004 DWT_CYCCNT RW 0x00000000 Cycle Count Register
0xE0001008 DWT_CPICNT RW - CPI Count Register
0xE000100C DWT_EXCCNT RW - Exception Overhead Count Register
0xE0001010 DWT_SLEEPCNT RW - Sleep Count Register
0xE0001014 DWT_LSUCNT RW - LSU Count Register
0xE0001018 DWT_FOLDCNT RW - Folded-instruction Count Register
0xE000101C DWT_PCSR RO - Program Counter Sample Register
0xE0001020 DWT_COMP0 RW - Comparator Register0
0xE0001024 DWT_MASK0 RW - Mask Register0
0xE0001028 DWT_FUNCTION0 RW 0x00000000 Function Register0
0xE0001030 DWT_COMP1 RW - Comparator Register1
0xE0001034 DWT_MASK1 RW - Mask Register1
0xE0001038 DWT_FUNCTION1 RW 0x00000000 Function Register1
0xE0001040 DWT_COMP2 RW - Comparator Register2
0xE0001044 DWT_MASK2 RW - Mask Register2
0xE0001048 DWT_FUNCTION2 RW 0x00000000 Function Register2
0xE0001050 DWT_COMP3 RW - Comparator Register3
0xE0001054 DWT_MASK3 RW - Mask Register3
0xE0001058 DWT_FUNCTION3 RW 0x00000000 Function Register3
0xE0001FD0 PID4 RO 0x04 Peripheral identification registers
0xE0001FD4 PID5 RO 0x00
0xE0001FD8
PID6 RO 0x00
0xE0001FDC
PID7 RO 0x00
0xE0001FE0
PID0 RO 0x02
0xE0001FE4
PID1 RO 0xB0
0xE0001FE8
PID2 RO 0x3B
0xE0001FEC
PID3 RO 0x00