ARM Cortex-M3 User Manual

Trace Port Interface Unit
ARM DDI 0337G Copyright © 2005-2008 ARM Limited. All rights reserved. 17-11
Selected Pin Protocol Register
Use the Selected Pin Protocol Register to select which protocol to use for trace output.
The register address, access type, and Reset state are:
Address
0xE00400F0
Access Read/write
Reset state
0x01
Figure 17-5 shows the bit assignments of the Selected Pin Protocol Register.
Figure 17-5 Selected Pin Protocol Register bit assignments
Table 17-7 describes the bit assignments of the Selected Pin Protocol Register.
Note
If this register is changed while trace data is being output, data corruption occurs.
Formatter and Flush Status Register
Use the Formatter and Flush Status Register to read the status of TPIU formatter.
The register address, access type, and Reset state are:
Address
0xE0040300
Access Read only
Reset state
0x08
31 2 0
Reserved
1
PROTOCOL
Table 17-7 Selected Pin Protocol Register bit assignments
Bits Field Function
[31:2] - Reserved
[1:0] PROTOCOL 00 - TracePort mode
01 - SerialWire Output (Manchester). This is the reset value.
10 - SerialWire Output (NRZ)
11 - Reserved.

ARM Cortex-M3 Specifications

General

Architecture	ARMv7-M
Instruction Set	Thumb-2
Pipeline Stages	3-stage
Interrupts	Nested Vectored Interrupt Controller (NVIC)
Interrupt Controller	Nested Vectored Interrupt Controller (NVIC)
Memory Protection Unit	Optional
Power Consumption	Varies by implementation
Max Clock Speed	Up to 100 MHz
Debugging	JTAG and Serial Wire Debug (SWD)
Operating Voltage	1.8V to 3.6V
Manufacturing Process	Varies by implementation
Core Type	32-bit