Nxp Semiconductors UM10237 用户手册

UM10237_2

© NXP B.V. 2008. All rights reserved.

Remark: JTAG access to the LPC2400 is only possible if no code read protection is 
selected, see 

.

The JTAG port may be used either for debug or for boundary scan. The state of the 
DBGEN pin determines which function is available. When DBGEN = 0, the JTAG port may 
be used for boundary scan. When DBGEN = 1, the JTAG port may be used for debug.

The EmbeddedICE logic contains 16 registers as shown in 

 below. The 

ARM7TDMI-S debug architecture is described in detail in "ARM7TDMI-S (rev 4) Technical 
Reference Manual" (ARM DDI 0234A) published by ARM Limited.

 

The block diagram of the debug environment is shown below in 

.

Debug Control

6

Force debug state, disable interrupts

00000

Debug Status

5

Status of debug

00001

Debug Comms Control Register

32

Debug communication control register

00100

Debug Comms Data Register

32

Debug communication data register

00101

Watchpoint 0 Address Value

32

Holds watchpoint 0 address value

01000

Watchpoint 0 Address Mask

32

Holds watchpoint 0 address mask

01001

Watchpoint 0 Data Value

32

Holds watchpoint 0 data value

01010

Watchpoint 0 Data Mask

32

Holds watchpoint 0 data mask

01011

Watchpoint 0 Control Value

9

Holds watchpoint 0 control value

01100

Watchpoint 0 Control Mask

8

Holds watchpoint 0 control mask

01101

Watchpoint 1 Address Value

32

Holds watchpoint 1 address value

10000

Watchpoint 1 Address Mask

32

Holds watchpoint 1 address mask

10001

Watchpoint 1 Data Value

32

Holds watchpoint 1 data value

10010

Watchpoint 1 Data Mask

32

Holds watchpoint 1 data mask

10011

Watchpoint 1 Control Value

9

Holds watchpoint 1 control value

10100

Watchpoint 1 Control Mask

8

Holds watchpoint 1 control mask

10101