MPC8540 datasheet(1130/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

20-24

Freescale Semiconductor

Debug Features and Watchpoint Facility

20.3.3 Context ID Registers

This section describes the context ID registers. The current context ID register (CCIDR) and

programmed context ID registers (PCIDR) are set by software and facilitate debugging complex

software.

20.3.3.1 Programmed Context ID Register (PCIDR)

The programmed context ID register (PCIDR), shown in Figure 20-17, contains the

user-programmed context ID. This register can be configured to trigger watchpoint events when

its value matches the current context ID register (CCIDR), as controlled by WMCR0[ECEN] and

WMCR0[NECEN]. See Section 20.3.1.1, “Watchpoint Monitor Control Registers 0–1 (WMCR0,

WMCR1),” for more information.

Table 20-23 describes the PCIDR field.

20.3.3.2 Current Context ID Register (CCIDR)

The current context ID register (CCIDR) shown in Figure 20-18 contains the current context ID.

This register is written by software after a context switch and can be used to trigger events when

compared with the programmed context ID register (PCIDR).

PCID

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xE_20A0

Figure 20-17. Programmed Context ID Register (PCIDR)

Table 20-23. PCIDR Field Descriptions

Bits

Name

Description

0–31

PCID Programmed context ID. Contains the user-programmed context ID. Compared with current context ID

for context-sensitive event triggering.

CCID

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xE_20A4

Figure 20-18. Current Context ID Register (CCIDR)

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