User manual

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

101

102

103

104

105

106

107

108

109

110

www.ti.com

Cortex-M3 Processor Registers

Table 2-78. FUNCTION1 Register Field Descriptions (continued)

Bit Field Type Reset Description

3-0 FUNCTION R/W X

Function settings: 0x0: Disabled 0x1: EMITRANGE = 0, sample and

emit PC through ITM. EMITRANGE = 1, emit address offset through

ITM 0x2: EMITRANGE = 0, emit data through ITM on read and write.

EMITRANGE = 1, emit data and address offset through ITM on read

or write. 0x3: EMITRANGE = 0, sample PC and data value through

ITM on read or write. EMITRANGE = 1, emit address offset and data

value through ITM on read or write. 0x4: Watchpoint on PC match.

0x5: Watchpoint on read. 0x6: Watchpoint on write. 0x7: Watchpoint

on read or write. 0x8: ETM trigger on PC match 0x9: ETM trigger on

read 0xA: ETM trigger on write 0xB: ETM trigger on read or write

0xC: EMITRANGE = 0, sample data for read transfers. EMITRANGE

= 1, sample Daddr (lower 16 bits) for read transfers 0xD:

EMITRANGE = 0, sample data for write transfers. EMITRANGE = 1,

sample Daddr (lower 16 bits) for write transfers 0xE: EMITRANGE =

0, sample PC + data for read transfers. EMITRANGE = 1, sample

Daddr (lower 16 bits) + data for read transfers 0xF: EMITRANGE =

0, sample PC + data for write transfers. EMITRANGE = 1, sample

Daddr (lower 16 bits) + data for write transfers Note 1: If the ETM is

not fitted, then ETM trigger is not possible. Note 2: Data value is only

sampled for accesses that do not fault (MPU or bus fault). The PC is

sampled irrespective of any faults. The PC is only sampled for the

first address of a burst. Note 3: FUNCTION is overridden for

comparators given by DATAVADDR0 and DATAVADDR1 if

DATAVMATCH is also set. The comparators given by

DATAVADDR0 and DATAVADDR1 can then only perform address

comparator matches for comparator 1 data matches. Note 4: If the

data matching functionality is not included during implementation it is

not possible to set DATAVADDR0, DATAVADDR1, or

DATAVMATCH. This means that the data matching functionality is

not available in the implementation. Test the availability of data

matching by writing and reading DATAVMATCH. If it is not settable

then data matching is unavailable. Note 5: PC match is not

recommended for watchpoints because it stops after the instruction.

It mainly guards and triggers the ETM.

109

SWCU117A–February 2015–Revised March 2015

Submit Documentation Feedback