Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X Datenbogen
Produktcode
DK-TM4C129X
Register 21: 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.
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.
Note:
When an alternate clock source is enabled, a read of this register returns the current count
-1.
-1.
When a 16/32-bit 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.
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)
16/32-bit Timer 0 base: 0x4003.0000
16/32-bit Timer 1 base: 0x4003.1000
16/32-bit Timer 2 base: 0x4003.2000
16/32-bit Timer 3 base: 0x4003.3000
16/32-bit Timer 4 base: 0x4003.4000
16/32-bit Timer 5 base: 0x4003.5000
16/32-bit Timer 6 base: 0x400E.0000
16/32-bit Timer 7 base: 0x400E.1000
Offset 0x054
Type RW, reset 0x0000.FFFF
16/32-bit Timer 1 base: 0x4003.1000
16/32-bit Timer 2 base: 0x4003.2000
16/32-bit Timer 3 base: 0x4003.3000
16/32-bit Timer 4 base: 0x4003.4000
16/32-bit Timer 5 base: 0x4003.5000
16/32-bit Timer 6 base: 0x400E.0000
16/32-bit Timer 7 base: 0x400E.1000
Offset 0x054
Type RW, reset 0x0000.FFFF
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
TBV
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
TBV
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Type
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Reset
Description
Reset
Type
Name
Bit/Field
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.
When written, the value written into this register is loaded into the
GPTMTAR register on the next clock cycle.
Note:
In 16-bit mode, only the lower 16-bits of the GPTMTBV
register can be written with a new value. Writes to the
prescaler bits have no effect.
register can be written with a new value. Writes to the
prescaler bits have no effect.
0x0000.FFFF
RW
TBV
31:0
December 13, 2013
1162
Texas Instruments-Advance Information
General-Purpose Timers