ARM Cortex R4F - Manual (Page 171)

Events and Performance Monitor
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6.3 Performance monitoring registers
The performance monitoring registers are described in:
•
c9, Performance Monitor Control Register
• c9, Count Enable Set Register on page 6-8
• c9, Count Enable Clear Register on page 6-9
• c9, Overflow Flag Status Register on page 6-10
• c9, Software Increment Register on page 6-11
• c9, Performance Counter Selection Register on page 6-12
• c9, Cycle Count Register on page 6-13
• c9, Event Selection Register on page 6-13
• c9, Performance Monitor Count Registers on page 6-15
• c9, User Enable Register on page 6-15
• c9, Interrupt Enable Set Register on page 6-16
• c9, Interrupt Enable Clear Register on page 6-17.
6.3.1 c9, Performance Monitor Control Register
The Performance MoNitor Control (PMNC) Register controls the operation of the three count
registers, and the CCNT Register.
The PMNC Register is:
• A read/write register.
• Always accessible in Privileged mode. The USEREN Register determines accessibility in
User mode, see c9, User Enable Register on page 6-15.
Figure 6-1 shows the bit arrangement for the PMNC Register.
Figure 6-1 PMNC Register format
Table 6-2 shows how the bit values correspond with the PMNC Register.
D C P E IMP
31 11 6 4 3 2 1 0
IDCODE N
10
Reserved
D
P
5
X
24 23 16 15
Table 6-2 PMNC Register bit functions
Bits Field Function
[31:24] IMP Implementer code:
0x41 = ARM
[23:16] IDCODE Identification code:
0x14 = Cortex-R4
[15:11] N Specifies the number of counters implemented:
0x3
= three counters implemented
[10: 6] Reserved RAZ on reads, Should Be Zero or Preserved (SBZP) on writes
[5] DP Disable CCNT when prohibited, that is, when non-invasive debug is not enabled:
0 = Count is enabled in prohibited regions. This is the reset value.
1 = Count is disabled in prohibited regions.