Figure 291. Control Unit - ST STM32F205 series Reference Manual

RM0033
Control unit
The control unit contains the power management functions and the clock divider for the
memory card clock.
There are three power phases:
•
power-off
•
power-up
•
power-on
The control unit is illustrated in
a clock management subunit.
The power management subunit disables the card bus output signals during the power-off
and power-up phases.
The clock management subunit generates and controls the SDIO_CK signal. The SDIO_CK
output can use either the clock divide or the clock bypass mode. The clock output is
inactive:
• after reset
•
during the power-off or power-up phases
•
if the power saving mode is enabled and the card bus is in the Idle state (eight clock
periods after both the command and data path subunits enter the Idle phase)
Adapter
registers
Secure digital input/output interface (SDIO)

Figure 291. Control unit

Control unit
Power management
Clock management
To command and data path
Figure 291. It consists of a power management subunit and
RM0033 Rev 8
SDMMC_CK
ai14804b
741/1378
792