FAQ
- M051 Base Series(95)
- M0518 Series(97)
- M0519 Series(43)
- M0564 Series(1)
- Mini51 Base Series(90)
- Nano100/102 Base Series(101)
- Nano103 Base Series(10)
- Nano110/112 LCD Series(100)
- Nano120 USB Series(111)
- Nano130 Advanced Series(110)
- NUC029 Series(94)
- NUC100/200 Advanced Series(102)
- NUC120/122/123/220 USB Series(116)
- NUC121/125 Series(1)
- NUC126 USB Series(2)
- NUC130/230 CAN Series(103)
- NUC131/NUC1311 CAN Series(98)
- NUC140/240 Connectivity Series(114)
Products
Applications
Function
+
FAQ
How to set the High Slew Rate Control Register to increase the SPI frequency to 36 MHz without causing waveform distortion? Issue Date：2018-03-08
When GPIO is configured to SPI mode, the High Slew Rate I/O is disabled by default. The user must set the GPIO High Slew Rate Control Register to enable the High Slew Rate I/O mode for adjusting the SPI frequency to 36MHz
The programming example is as follows:
//Set SYS MFP to SPI mode
SYS->GPB_MFPL |= (SYS_GPB_MFPL_PB2MFP_SPI0_CLK | SYS_GPB_MFPL_PB3MFP_SPI0_MISO0 | SYS_GPB_MFPL_PB4MFP_SPI0_SS | SYS_GPB_MFPL_PB5MFP_SPI0_MOSI0);
//Set GPIO to High Slew Rate I/O mode
PB->SLEWCTL |= (GPIO_SLEWCTL_HSREN2_Msk | GPIO_SLEWCTL_HSREN3_Msk | GPIO_SLEWCTL_HSREN4_Msk | GPIO_SLEWCTL_HSREN5_Msk);
| Products: | Microcontrollers ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,M4TK Touch Key Series |
|---|---|
| Applications: | |
| Function: | Peripherals,Connectivity,SPI,I/O,GPIO |