米6体育平台手机版

SLAU846A June 2023 – October 2023 MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G3105 , MSPM0G3105-Q1 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3505 , MSPM0G3505-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1

1
Read This First
1. About This Manual
2. Notational Conventions
3. Glossary
4. Support Resources
5. Trademarks
1 Architecture
1. 1.1 Architecture Overview
2. 1.2 Bus Organization
3. 1.3 Platform Memory Map
4. 1.4 Boot Configuration
5. 1.5 NONMAIN Registers
6. 1.6 Factory Constants
  1. 1.6.1 FACTORYREGION Registers
2 PMCU
1. 2.1 PMCU Overview
  1. 2.1.1 Power Domains
  2. 2.1.2 Operating Modes
2. 2.2 Power Management (PMU)
3. 2.3 Clock Module (CKM)
4. 2.4 System Controller (SYSCTL)
5. 2.5 Quick Start Reference
6. 2.6 SYSCTL Registers
3 CPU
1. 3.1 Overview
2. 3.2 Arm Cortex-M0+ CPU
3. 3.3 Interrupts and Exceptions
4. 3.4 CPU Peripherals
5. 3.5 Read-Only Memory (ROM)
6. 3.6 CPUSS Registers
7. 3.7 WUC Registers
4 DMA
1. 4.1 DMA Overview
2. 4.2 DMA Operation
3. 4.3 DMA Registers
5 MATHACL
1. 5.1 Overview
2. 5.2 Data Format
3. 5.3 Basic Operation
4. 5.4 Configuration Details with Examples
5. 5.5 MATHACL Registers
6 NVM (Flash)
1. 6.1 NVM Overview
2. 6.2 Flash Memory Bank Organization
3. 6.3 Flash Controller
4. 6.4 Write Protection
5. 6.5 Read Interface
  1. 6.5.1 Bank Address Swapping
  2. 6.5.2 ECC Error Handling
    1. 6.5.2.1 Single bit (correctable) errors
    2. 6.5.2.2 Dual bit (uncorrectable) errors
6. 6.6 FLASHCTL Registers
7 Events
1. 7.1 Events Overview
2. 7.2 Events Operation
8 IOMUX
1. 8.1 IOMUX Overview
  1. 8.1.1 IO Types and Analog Sharing
2. 8.2 IOMUX Operation
3. 8.3 IOMUX (PINCMx) Register Format
4. 8.4 IOMUX Registers
9 GPIO
1. 9.1 GPIO Overview
2. 9.2 GPIO Operation
3. 9.3 GPIO Registers
10ADC
1. 10.1 ADC Overview
2. 10.2 ADC Operation
3. 10.3 ADC12 Registers
11COMP
1. 11.1 Comparator Overview
2. 11.2 Comparator Operation
3. 11.3 COMP Registers
12OPA
1. 12.1 OPA Overview
2. 12.2 OPA Operation
3. 12.3 OA Registers
13GPAMP
1. 13.1 GPAMP Overview
2. 13.2 GPAMP Operation
3. 13.3 GPAMP Registers
14DAC
1. 14.1 DAC Introduction
2. 14.2 DAC Operation
3. 14.3 DAC12 Registers
15VREF
1. 15.1 VREF Overview
2. 15.2 VREF Operation
3. 15.3 VREF Registers
16UART
1. 16.1 UART Overview
2. 16.2 UART Operation
3. 16.3 UART Registers
17SPI
1. 17.1 SPI Overview
2. 17.2 SPI Operation
3. 17.3 SPI Registers
18I2C
1. 18.1 I2C Overview
2. 18.2 I2C Operation
19I2C Registers
20CAN-FD
1. 20.1 MCAN Overview
  1. 20.1.1 MCAN Features
2. 20.2 MCAN Environment
3. 20.3 CAN Network Basics
4. 20.4 MCAN Functional Description
5. 20.5 MCAN Integration
6. 20.6 Interrupt and Event Support
  1. 20.6.1 CPU Interrupt Event Publisher (CPU_INT)
7. 20.7 MCAN Registers
21MCAN Registers
22CRC
1. 22.1 CRC Overview
  1. 22.1.1 CRC16-CCITT
  2. 22.1.2 CRC32-ISO3309
2. 22.2 CRC Operation
  1. 22.2.1 CRC Generator Implementation
  2. 22.2.2 Configuration
3. 22.3 CRC Registers
23AES
1. 23.1 AES Overview
  1. 23.1.1 AES Performance
2. 23.2 AES Operation
3. 23.3 AES Registers
24TRNG
1. 24.1 TRNG Overview
2. 24.2 TRNG Operation
3. 24.3 TRNG Registers
25Timers (TIMx)
1. 25.1 TIMx Overview
2. 25.2 TIMx Operation
3. 25.3 Timers (TIMx) Registers
26RTC
1. 26.1 Overview
2. 26.2 Basic Operation
3. 26.3 Configuration
4. 26.4 RTC Registers
27WWDT
1. 27.1 WWDT Overview
  1. 27.1.1 Watchdog Mode
  2. 27.1.2 Interval Timer Mode
2. 27.2 WWDT Operation
3. 27.3 WWDT Registers
28Debug
1. 28.1 Overview
2. 28.2 Debug Features
3. 28.3 Behavior in Low Power Modes
4. 28.4 Restricting Debug Access
5. 28.5 Mailbox (DSSM)
  1. 28.5.1 DSSM Events
    1. 28.5.1.1 CPU Interrupt Event (CPU_INT)
  2. 28.5.2 DEBUGSS Registers
29Revision History

5.4.3 Square Root (SQRT)

The square root function (SQRT) computes the square root of a number (radicand). The square root is computed incrementally by the number of iterations in the CTL.NUMITER field. A higher number of iterations calculates more accurate results but takes longer to compute.

The radicand must be in UQm.n data type, and it is broken down into two components: an unscaled number (UN) and a scaled number (SN). The unscaled number is the floor of the number, and the scaled number is between 1.0 and 2.0 in UQ2.30 format. The relationship between the scaled number (SN) and unscaled number (UN) is the scale factor (SFACTOR), which is shown in Equation 16.

Equation 16.

S c a l e d n u m b e r (S N) = \frac{U n s c a l e d n u m b e r (U N)}{2^{S F A C T O R}}

To calculate the SN and SFACTOR from a radicand in UQm.n format, the algorithm below can be used.

//Compute scale factor and scaled number from radicand

UN = floor(radicand);         //unsigned number
SFACTOR = 0;                  //scale factor
count = 2;                    //scaled number must be between 1 and 2
do { 
   SFACTOR++;                 //incease SFACTOR
   count <<= 1;               //multiply by 2
} while (count < UN)          //repeat until UN is less than count

SN = radicand / (count >> 1); //scale number = radicand / 2^SN

For example, if the 10.375 is the radicand, the unscaled number is 10, SFACTOR = 3 (10.375 / 2³ = 1.297), and 1.297 is the scaled number between 1.0 and 2.0.

Table 5-6 shows the configuration registers for the SQRT function.

Table 5-6 SQRT configuration registers

Register (Bit Field)	Value	Description
OP1	User value	Scaled number (SN) in UQ2.30 format. The scaled number is scaled from the unscaled number, and the scaled number has to be between 1.0 and 2.0.
CTL.FUNC	5h	SQRT
CTL.SFACTOR	User value	Scaling factor n. The scaled number (SN) = (Unscaled number)/2ⁿ. This is a signed integer and takes a positive value or negative value in two’s compliment.
CTL.NUMITER	User value	Number of iterations
RES1	32-bit result	Square root of unscaled number in UQ16.16 format.

A higher number of iterations (NUMITER) calculates more accurate results but takes longer to compute.

Status, Errors, and Overflow

There are no status, error, or overflow bits for SQRT.

Configuration

To perform a SQRT:

In the CTL register:
1. Set FUNC to 5h.
2. Set NUMITER to the number of iterations for the calculation.
3. Set SFACTOR to the scaling factor n.
Set the scaled number (UQ2.30 format) in OP2 to begin the computation.
Read the square root result in RES1 (UQ16.16 format).