Freescale-semiconductor StarCore SC140 Manual do Utilizador descarregar pdf (Página 168)

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4-58 SC140 DSP Core Reference Manual

Event Detection Unit (EDU) Channels and Registers

4.9.2 Data Event Detection Channel (EDCD)

In order to set a watchpoint on a given data value, the user should:

• Write the watched value into the EDCD_REF.

• Enter a write mask into the EDCD_MASK.

• Specify the type of access (read or write) in the EDCD_CTRL.

• Specify the data type (byte/word/long) in the EDCD_CTRL.

• Enable the event detection unit in EDCD_CTRL, as the last action.

The following sections describe the functionality of these registers.

4.9.2.1 EDCD Control Register (EDCD_CTRL)

Figure 4-22 displays the configuration of EDCD_CTRL.

The shaded bits are reserved and should be initialized with zeros for future software compatibility.

Figure 4-22. EDCD Control Register (EDCD_CTRL)

Table 4-20 describes the EDCD_CTRL fields.

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 BIT 0

AWS EDCDEN CCS ATS

TYPE rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

RESET 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Table 4-20. EDCD_CTRL Description

Name Description Settings

Bits

14-15

Reserved

Bits

13–10

Reserved

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 759 760

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