Table 88. Ltdc Registers Versus Clock Domain - ST STM32F405 Reference Manual

LCD-TFT controller (LTDC)
Care must be taken when accessing the LTDC registers since the APB2 bus is stalling when
the following operations are ongoing:
•
Register write access and update for 6 xPCKL2 period + 5x LCD_CLK period (5x
HCLK period for register on AHB clock domain)
•
Register read access for 7xPCKL2 period + 5x LCD_CLK period (5x HCLK period for
register on AHB clock domain).
For registers on PCLK2 clock domain, APB2 bus is stalling during the register write access
for 6 xPCKL2 period and 7xPCKL2 period for read access.
The LCD controller can be reset by setting the corresponding bit in the RCC_APB2RSTR
register. It resets the three clock domains.
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Table 88. LTDC registers versus clock domain

LTDC registers
LTDC_LxCR
LTDC_LxCFBAR
LTDC_LxCFBLR
LTDC_LxCFBLNR
LTDC_SRCR
LTDC_IER
LTDC_ISR
LTDC_ICR
LTDC_SSCR
LTDC_BPCR
LTDC_AWCR
LTDC_TWCR
LTDC_GCR
LTDC_BCCR
LTDC_LIPCR
LTDC_CPSR
LTDC_CDSR
LTDC_LxWHPCR
LTDC_LxWVPCR
LTDC_LxCKCR
LTDC_LxPFCR
LTDC_LxCACR
LTDC_LxDCCR
LTDC_LxBFCR
LTDC_LxCLUTWR
RM0090 Rev 18
Clock domain
HCLK
PCLK2
Pixel Clock (LCD_CLK)
RM0090