P912XDP512F0MPVR datasheet(702/1348 Pages) FREESCALE

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Chapter 19 S12X Debug (S12XDBGV2) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

704

Freescale Semiconductor

19.3.1.6

Debug Count Register (DBGCNT)

Read: Anytime

Write: Never

0x0026

76543210

CNT

Reset

—

—————

POR

00000000

Unimplemented or Reserved

Figure 19-9. Debug Count Register (DBGCNT)

Table 19-17. DBGCNT Field Descriptions

Field

Description

6–0

CNT[6:0]

Count Value — The CNT bits [6:0] indicate the number of valid data 64-bit data lines stored in the trace buffer.

Table 19-18 shows the correlation between the CNT bits and the number of valid data lines in the trace buffer.

When the CNT rolls over to 0, the TBF bit in DBGSR is set and incrementing of CNT will continue in end-trigger

or mid-trigger mode. The DBGCNT register is cleared when ARM in DBGC1 is written to a 1. The DBGCNT

occur during a debug session, the DBGCNT register still indicates after the reset, the number of valid trace buffer

entries stored before the reset occurred. The DBGCNT register is not decremented when reading from the trace

buffer.

Table 19-18. CNT Decoding Table

TBF (DBGSR)

CNT[6:0]

Description

0000000

No data valid

0000001

32 bits of one line valid1

1 This applies to normal/loop1 modes when tracing from either CPU or XGATE only.

0000010

1 line valid

0000011

0000100

0000110

1111100

1.5 lines valid1

2 lines valid

3 lines valid

62 lines valid

1111110

63 lines valid

0000000

64 lines valid; if using begin-trigger alignment,

ARM bit will be cleared and the tracing session ends.

0000010

1111110

64 lines valid,

oldest data has been overwritten by most recent data

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