LM3S9B81 Datasheet, PDF (441/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Stellaris® LM3S9B81 Microcontroller
Register 2: GPTM Timer A Mode (GPTMTAMR), offset 0x004
This register configures the GPTM based on the configuration selected in the GPTMCFG register.
When in 16-bit PWM mode, set the TAAMS bit , clear the TACMR bit, and configure the TAMR field to
0x2.
In 16-bit timer configuration, TAMR controls the 16-bit timer modes for Timer A. In 32-bit timer
configuration, this register controls the mode, and the contents of GPTMTBMR are ignored.
GPTM Timer A Mode (GPTMTAMR)
Timer0 base: 0x4003.0000
Timer1 base: 0x4003.1000
Timer2 base: 0x4003.2000
Timer3 base: 0x4003.3000
Offset 0x004
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
TASNAPS TAWOT TAMIE TACDIR TAAMS TACMR
TAMR
Type RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:8
7
Name
reserved
TASNAPS
Type
RO
R/W
Reset Description
0x0000.00 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0
GPTM Timer A Snap-Shot Mode
Value Description
0 Snap-shot mode is disabled.
1 If Timer A is configured in the periodic mode, the actual
free-running value of Timer A is loaded at the time-out event
into the GPTM Timer A (GPTMTAR) register.
6
TAWOT
R/W
0
GPTM Timer A Wait-on-Trigger
Value Description
0 Timer A begins counting as soon as it is enabled.
1 If Timer A is enabled (TAEN is set in the GPTMCTL register),
Timer A does not begin counting until it receives a trigger from
the timer in the previous position in the daisy chain, see Figure
11-5 on page 434. This function is valid for both one-shot and
periodic modes.
This bit must be clear for GP Timer Module 0, Timer A.
June 29, 2010
441
Texas Instruments-Advance Information