LM3S1H11 Datasheet, PDF (577/956 Pages) Texas Instruments – Stellaris® LM3S1H11 Microcontroller

Stellaris^® LM3S1H11 Microcontroller
Register 20: GPTM Timer B Value (GPTMTBV), offset 0x054
When read, this register shows the current, free-running value of Timer B in all modes. Software
can use this value to determine the time elapsed between an interrupt and the ISR entry. When
written, the value written into this register is loaded into the GPTMTBR register on the next clock
cycle. In Input Edge-Count mode, bits 23:16 contain the upper 8 bits of the count.
When a GPTM is configured to one of the 32-bit modes, the contents of bits 15:0 in this register are
loaded into the upper 16 bits of the GPTMTAV register. Reads from this register return the current
free-running value of Timer B. In a 16-bit mode, bits 15:0 contain the value of the counter and bits
23:16 contain the current, free-running value of the prescaler, which is the upper 8 bits of the count
in Input Edge Count, Input Edge Time, PWM and one-shot or periodic up count modes. In one-shot
or periodic down count modes, the prescaler stored in 23:16 is a true prescaler, meaning bits 23:16
count down before decrementing the value in bits 15:0. The prescaler in bits 31:24 always reads
as 0.
GPTM Timer B Value (GPTMTBV)
Timer 0 base: 0x4003.0000
Timer 1 base: 0x4003.1000
Timer 2 base: 0x4003.2000
Timer 3 base: 0x4003.3000
Offset 0x054
Type RW, reset 0x0000.FFFF
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TBV
Type RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
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
TBV
Type RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Reset
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Bit/Field
31:0
Name
TBV
Type
Reset Description
RW 0x0000.FFFF GPTM Timer B Value
A read returns the current, free-running value of Timer A in all modes.
When written, the value written into this register is loaded into the
GPTMTAR register on the next clock cycle.
January 23, 2012
577
Texas Instruments-Production Data