© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 01 — 12 January 2006 251
Philips Semiconductors
UM10161
Volume 1 Chapter 20: EmbeddedICE
have them come up as GPIO pins, do not connect a bias resistor, and ensure that any
external driver connected to Pin 26 (RTCK) is either driving high or is in high-impedance
state during Reset.
20.6 Register description
The EmbeddedICE logic contains 16 registers as shown in Table 2 3 7 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.
20.7 Block diagram
The block diagram of the debug environment is shown below in Figure 64.
Table 237: EmbeddedICE logic registers
Name Width Description Address
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
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