TMS320F28027, TMS320F28027-Q1, TMS320F28027F, TMS320F28027F-Q1, TMS320F28026
TMS320F28026-Q1, TMS320F28026F, TMS320F28026F-Q1, TMS320F28023
TMS320F28023-Q1, TMS320F28022, TMS320F28021, TMS320F28020, TMS320F280200
ZHCSA13P –NOVEMBER 2008 –REVISED FEBRUARY 2021
www.ti.com.cn
备注
Code Security Module Disclaimer
THE CODE SECURITY MODULE (CSM) INCLUDED ON THIS DEVICE WAS DESIGNED TO
PASSWORD PROTECT THE DATA STORED IN THE ASSOCIATED MEMORY (EITHER ROM OR
FLASH) AND IS WARRANTED BY TEXAS INSTRUMENTS (TI), IN ACCORDANCE WITH ITS
STANDARD TERMS AND CONDITIONS, TO CONFORM TO TI'S PUBLISHED SPECIFICATIONS
FOR THE WARRANTY PERIOD APPLICABLE FOR THIS DEVICE.
TI DOES NOT, HOWEVER, WARRANT OR REPRESENT THAT THE CSM CANNOT BE
COMPROMISED OR BREACHED OR THAT THE DATA STORED IN THE ASSOCIATED MEMORY
CANNOT BE ACCESSED THROUGH OTHER MEANS. MOREOVER, EXCEPT AS SET FORTH
ABOVE, TI MAKES NO WARRANTIES OR REPRESENTATIONS CONCERNING THE CSM OR
OPERATION OF THIS DEVICE, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL TI BE LIABLE FOR ANY CONSEQUENTIAL, SPECIAL, INDIRECT,
INCIDENTAL, OR PUNITIVE DAMAGES, HOWEVER CAUSED, ARISING IN ANY WAY OUT OF
YOUR USE OF THE CSM OR THIS DEVICE, WHETHER OR NOT TI HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED
TO LOSS OF DATA, LOSS OF GOODWILL, LOSS OF USE OR INTERRUPTION OF BUSINESS OR
OTHER ECONOMIC LOSS.
9.1.10 外设中断扩展(PIE) 块
PIE 块将许多中断源复用至中断输入的较小的集合中。PIE 块能够支持多达 96 个外设中断。在 F2802x 上，外设
使用96 个可能中断中的 33 个。96 个中断被分成 8 组，每组被提供 12 个CPU 中断线（INT1 或者INT12）中的
1 个。96 个中断中的每一个中断由其存储在一个可被用户写覆盖的专用 RAM 块中的矢量支持。在处理这个中断
时，这个矢量由 CPU 自动抽取。抽取这个矢量以及保存关键CPU 寄存器将花费 8 个CPU 时钟周期。因此 CPU
能够对中断事件作出快速响应。可以通过硬件和软件控制中断的优先级。每个中断都可以在PIE 块内启用/禁用。
9.1.11 外部中断(XINT1-XINT3)
此器件支持 3 个被屏蔽的外部中断 (XINT1-XINT3)。每一个中断可被选择成负边沿、正边沿、或者二者触发并能
够被启用/禁用。这些中断还包含一个 16 位自由运行的上数计数器，当检测到一个有效的中断边沿时，该计数器
复位为 0。这个计数器可被用于为中断精确计时。没有用于外部引脚的专用引脚。XINT1，XINT2，和 XINT3 中
断可接受来自GPIO0-GPIO3 引脚的输入。
9.1.12 内部零引脚振荡器、振荡器和PLL
此器件可由两个内部零引脚振荡器、一个外部振荡器或者一个连接至片上振荡器电路（只适用于 48 引脚器件）的
晶体中的任一个计时。一个提供的 PLL 支持高达 12 个输入时钟缩放比。PLL 比率可用软件中在器件运行时更
改，这使得用户在需要低功耗运行时能够按比例降低运行频率。请参阅节8，电气规格，了解时序详细信息。PLL
块可被设定为旁路模式。
9.1.13 看门狗
每个器件包含两个看门狗：一个是监视内核的 CPU 看门狗，一个是 NMI 看门狗，后者是时钟丢失检测电路。用
户软件必须在特定的时间范围内定期复位 CPU 看门狗计数器；否则，CPU 看门狗将生成对处理器的复位。必要
时可禁用CPU 看门狗。NMI 看门狗仅在发生时钟故障时才起作用，可生成一个中断或者器件复位。
9.1.14 Peripheral Clocking
The clocks to each individual peripheral can be enabled/disabled to reduce power consumption when a
peripheral is not in use. Additionally, the system clock to the serial ports (except I2C) can be scaled relative to
the CPU clock.
Copyright © 2022 Texas Instruments Incorporated
40
Submit Document Feedback
Product Folder Links: TMS320F28027 TMS320F28027-Q1 TMS320F28027F TMS320F28027F-Q1
TMS320F28026 TMS320F28026-Q1 TMS320F28026F TMS320F28026F-Q1 TMS320F28023 TMS320F28023-
Q1 TMS320F28022 TMS320F28021 TMS320F28020 TMS320F280200
TI [ TEXAS INSTRUMENTS ]
