TM4C123AH6PM Datasheet, PDF (709/1226 Pages) Texas Instruments – This data sheet provides reference information for the TM4C123AH6PM microcontroller, describing

Tiva^™ TM4C123AH6PM Microcontroller _{(identical to LM4F211H5QR)}
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.
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.
When a 32/64-bit Wide GPTM is configured to one of the 64-bit modes, GPTMTBV contains bits
63:32 of the 64-bit timer value and the GPTM Timer A Value (GPTMTAV) register contains bits
31:0. In a 32-bit mode, the current, free-running value of the prescaler is stored in the GPTM Timer
B Prescale Value (GPTMTBPV) register.
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
32/64-bit Wide Timer 0 base: 0x4003.6000
32/64-bit Wide Timer 1 base: 0x4003.7000
32/64-bit Wide Timer 2 base: 0x4004.C000
32/64-bit Wide Timer 3 base: 0x4004.D000
32/64-bit Wide Timer 4 base: 0x4004.E000
32/64-bit Wide Timer 5 base: 0x4004.F000
Offset 0x054
Type RW, reset -
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
1
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
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
0
0
1
0
0
1
1
0
0
1
0
0
1
0
1
1
Bit/Field
31:0
Name
TBV
Type
Reset Description
RW 0x0000.FFFF GPTM Timer B Value
(for 16/32-bit) _{A read returns the current, free-running value of Timer A in all modes.}
0xFFFF.FFFF _{When written, the value written into this register is loaded into the}
(for 32/64-bit) _{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.
July 17, 2013
709
Texas Instruments-Production Data