TM4C123FH6PM Datasheet, PDF (138/1371 Pages) Texas Instruments – Tiva™ TM4C123FH6PM Microcontroller

Cortex-M4 Peripherals
Register 2: SysTick Reload Value Register (STRELOAD), offset 0x014
Note: This register can only be accessed from privileged mode.
The STRELOAD register specifies the start value to load into the SysTick Current Value
(STCURRENT) register when the counter reaches 0. The start value can be between 0x1 and
0x00FF.FFFF. A start value of 0 is possible but has no effect because the SysTick interrupt and the
COUNT bit are activated when counting from 1 to 0.
SysTick can be configured as a multi-shot timer, repeated over and over, firing every N+1 clock
pulses, where N is any value from 1 to 0x00FF.FFFF. For example, if a tick interrupt is required
every 100 clock pulses, 99 must be written into the RELOAD field.
Note that in order to access this register correctly, the system clock must be faster than 8 MHz.
SysTick Reload Value Register (STRELOAD)
Base 0xE000.E000
Offset 0x014
Type RW, reset -
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
RELOAD
Type RO
RO
RO
RO
RO
RO
RO
RO
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
RELOAD
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
Bit/Field
31:24
23:0
Name
reserved
RELOAD
Type
RO
RW
Reset Description
0x00
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.
0x00.0000
Reload Value
Value to load into the SysTick Current Value (STCURRENT) register
when the counter reaches 0.
138
June 12, 2014
Texas Instruments-Production Data