AN4035 datasheet(16/42 Pages) STMICROELECTRONICS

16 / 42 page

On-Chip Emulation (OnCE)

AN4035

16/41

Doc ID 022669 Rev 2

Table 4 shows the OnCE register addresses. Access to the registers CPUSCR, DAC1-2,

DBCNT, DBCR0-3, DBSR, and IAC1-4 require that the external debug mode bit,

DBCR0[EDM], be set to a logical 1. Only the DBCR0[EDM] is accessible in the DBCR0

disables software updates to debug registers. The CPU should be placed in debug mode via

the OCR[DR] bit prior to setting the DBCR0[EDM] bit.

2EX

0 Remain in debug mode

1 Leave debug mode

If the EX bit is set, the processor leaves debug mode and resume normal operation until

another debug request is generated. The Exit command is executed only if the Go command

is issued, and the operation is a read/write to CPUSCR or a read/write to “No Register

Selected”. Otherwise the EX bit is ignored.

The processor leaves debug mode after the TAP controller Update-DR state is entered. Note

that if the DR bit in the OnCE control register is set or remains set, or if a bit in the DBSR is set,

or if a bit in the DBSR is set and DBCR0[EDM]=1 (external debug mode is enabled), then the

processor may return to debug mode without execution of an instruction, even though the EX

bit was set.

3-9

The Register Select bits define which register is source (destination) for the read (write)

operation. Attempted writes to read-only registers are ignored.

Table 3.

OnCE command register bit definitions (continued)

Bit(s)

Name

Description

Table 4.

e200z0 OnCE Register Addressing

RS[0:6]

000 0000

Reserved

000 0001

Reserved

000 0010

JTAG ID (read-only)

000 0011-000 1111

Reserved

001 0000

CPU Scan Register (CPUSCR)

001 0001

No Register Selected (Bypass)

001 0010

OnCE Control Register (OCR)

001 0011-001 1111

Reserved

010 0000

Instruction Address Compare 1 (IAC1)

010 0001

Instruction Address Compare 2 (IAC2)

010 0010

Instruction Address Compare 3 (IAC3)

010 0011

Instruction Address Compare 4 (IAC4)

010 0100

Data Address Compare 1 (DAC1)

010 0101

Data Address Compare 2 (DAC2)

010 0110

Data Value Compare 1 (DVC1)

010 0111

Data Value Compare 2 (DVC2)

AN4035 датащи(PDF) 16 Page - STMicroelectronics

AN4035 датащи(HTML) 16 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

датащи скачать

ссылки URL