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LM3S610-IQN50

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型号: LM3S610-IQN50
PDF文件:
  • LM3S610-IQN50 PDF文件
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功能描述: Microcontroller
PDF文件大小: 2341.71 Kbytes
PDF页数: 共396页
制造商: ETC2[List of Unclassifed Manufacturers]
制造商LOGO: ETC2[List of Unclassifed Manufacturers] LOGO
制造商网址:
捡单宝LM3S610-IQN50
PDF页面索引
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120%
General-Purpose Timers
152 October 8, 2006
Preliminary
Figure 9-4. 16-Bit PWM Mode Example
9.3 Initialization and Configuration
To use the general purpose timers, the peripheral clock must be enabled by setting the GPTM0,
GPTM1, and GPTM2 bits in the RCGC1 register.
This section shows module initialization and configuration examples for each of the supported
timer modes.
9.3.1 32-Bit One-Shot/Periodic Timer Mode
The GPTM is configured for 32-bit One-Shot and Periodic modes by the following sequence:
1. Ensure the timer is disabled (the TAEN bit in the GPTMCTL register is cleared) before making
any changes.
2. Write t he GPTM Configuration Register (GPTMCFG) with a value of 0x0.
3. Set the TAMR field in the GPTM TimerA Mode Register (GPTMTAMR):
a. Write a value of 0x1 for One-Shot mode.
b. Write a value of 0x2 for Periodic mode.
4. Load the start value into the GPTM TimerA Interval Load Register (GPTMTAILR).
5. If interrupts are required, set the TATOIM bit in the GPTM Interrupt Mask Register
(GPTMIMR).
6. Set the TAEN bit in the GPTMCTL register to enable the timer and start counting.
7. Poll the TATORIS bit in the GPTMRIS register or wait for the interrupt to be generated (if
enabled). In both cases, the status flags are cleared by writing a 1 to the TATOCINT bit of the
GPTM Interrupt Cle ar Register (GPTMICR).
Output
Signal
Time
Count
GPTMTnR=GPTMnMR GPTMTnR=GPTMnMR
0xC350
0x411A
TnP WML = 0
TnP WML = 1
TnEN set
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